An object is dropped from a height of 78.0 m. How long will it take to hit the ground?

Answers

Answer 1

Answer:

3.98978287s

Explanation:

v²=u²+2as

v²=0²+2(9.8)(78)

v²=1528.8m/s

∴v=39.09987212m/s (speed when object hits the ground)

v=u+at

39.09987212=0+9.8t

∴t=3.98978287s


Related Questions

Pregunta 1 (1 punto)
(05.02 LC)

In a battery (voltaic cell), in which direction do electrons flow? (1 point)

a
From the negative to the positive terminal

b
From the positive to the negative terminal

c
From the copper plate to the zinc plate

d
From the top of the plates to the bottom

Pregunta 2 (1 punto)
(05.02 LC)

Which statement best describes why some materials are not magnetic? (1 point)

a
Magnetic materials have many spinning unpaired electrons

b
Paired electrons spin in opposite directions, cancelling their magnetic fields

c
Electrons of magnetic materials are loosely held by atomic nuclei

d
Magnetic materials move positively charged particles to other atoms

Pregunta 3 (1 punto)
(05.02 LC)

If Keisha's thumb points in the direction of an electrical current, what will her fingers curled around the wire represent? (1 point)

a
The opposing electric current

b
The opposing magnetic current

c
The direction of the electric field

d
The direction of the magnetic field

Pregunta 4 (1 punto)
(05.02 MC)

A light bulb provides a resistance of 20 Ω to the 30 A current that runs through it. Determine the voltage of the battery in the flashlight. (1 point)

a
0.7 V

b
2 V

c
51 V

d
600 V

Pregunta 5 (1 punto)
(05.02 MC)

Alyssa is taking a walk on a nature path near her neighborhood. She carries a compass with her. As she walks along the path, she notices the needle on the compass is occasionally deflected from its original position. If she has not changed the direction she is walking, what is most likely causing the occasional shift in the needle? (1 point)

a
Changes in pressure

b
Changes in temperature

c
Sources of electrical current

d
Changes to Earth's magnetic field

Pregunta 6 (1 punto)
(05.02 MC)

Quickly spinning the handle of a hand generator, Kevan is able to light three bulbs in a circuit. When he uses two batteries instead of the generator, the bulbs are very dim. Which statement best explains why the batteries are not able to power all three light bulbs like the generator? (1 point)

a
The batteries do not make the charges move as much

b
The generator creates less voltage

c
The batteries have higher amperage

d
The generator current is more steady

Pregunta 7 (1 punto)
(05.02 MC)

A construction worker uses an electrical device to attract fallen nails and sharp objects from a construction site. What is causing the attraction of the metal objects? (1 point)

a
An electrical wave oscillating perpendicular to the electrical device.

b
An electrical charge radiating perpendicular to the wire

c
A magnetic wave radiating perpendicular to an electrical device

d
A magnetic wave and electrical current moving in opposite directions

Pregunta 8 (1 punto)
(05.02 MC)

A tablet draws 10.0 A when plugged into a 150-V line. If another tablet has twice as much resistance, what would the current of the second tablet be if plugged into the same line? (1 point)

a
0.60 A

b
1.5 A

c
5 A

d
15 A

Answers

B the answer is B Hope this helps

In a battery (voltaic cell), the electrons flow from the negative to the positive terminal.

What is meant by electric current ?

Electric current is defined as the rate of flow of electric charge through any cross-section in an electric circuit.

Here,

1) In a battery (voltaic cell), the electrons flow from the negative to the positive terminal.

2) Some materials are not magnetic because, they have equal number of electrons that spin in opposite direction. Thus, the paired electrons spin in opposite directions, cancelling their magnetic fields.

3) According to Right-hand thumb rule, if Keisha's thumb points in the direction of an electrical current, her fingers curled around the wire will represent the direction of magnetic field.

4) Resistance of the light bulb, R = 20 Ω

   Current flowing through the light bulb, I = 30 A

Voltage of the battery,

V = IR

V = 30 x 20

V = 600 V

5) The deflection in the needle of the compass is due to the change in the Earth's magnetic field.

6) The batteries are not able to power all three light bulbs like the generator because, the generator current is more steady.

7) The attraction of the metal objects towards the electrical device is due to an electrical wave oscillating perpendicular to the electrical device.

8) Current in the first tablet, I₁ = 10 A

Voltage applied, V = 150 V

We know that,

I [tex]\alpha[/tex] 1/R

Therefore,

I₁/I₂ = R₂/R₁

I₂ = R₁I₁/R₂

I₂ = R x 10/2R

I₂ = 10/2 = 5 A

So, the current of the second tablet is 5 A.

Hence,

In a battery (voltaic cell), the electrons flow from the negative to the positive terminal.

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A wave vibrates up and down 22 cycles in 7 seconds with a wave speed of 57. Calculate the
wavelength. (Round to the 2nd number after the decimal)

Answers

Answer:

18.14m

Explanation:

Given parameters:

Frequency = [tex]\frac{22}{7}[/tex]cycles/s

Speed of wave = 57m/s

Unknown:

Wavelength  = ?

Solution:

The speed of a wave is related to frequency and wavelength using the expression below;

         V = f x λ

V is the speed of the wave

f is the frequency

λ is the wavelength

  Insert the parameters and find λ;

        57  =  [tex]\frac{22}{7}[/tex] x λ

       λ = 57 x [tex]\frac{7}{22}[/tex]   = 18.14m

If a wire lies within a magnetic field, what must be true for the magnetic field
to produce an electric current in the wire?
O A. The field must be produced by induced magnetism.
O B. The field must be produced by an electromagnet.
O C. The field must be moving.
D. The field must not be moving.

Answers

The wire that lies within a magnetic field must be true for the magnetic field to produce an electric current in the wire is, and the field must be moving. Hence, option C is correct.

What is magnetic Field?

Magnetic forces can be seen in a magnetic field, an electric current, a changing electric field, or a vector field around a magnet. Compass blades and other ferromagnetic materials align in the path of magnetic fields like the one found on Earth.

Electrically charged particles are forced to move in a circular or helical pattern by magnetic fields. The operation of electric motors is caused by this force, which is applied to electrical impulses in wires in such a magnetic field.

Magnetization is stationary and is referred to as a magnetization field when it surrounds a magnetic core or a wire delivering a constant electric current in a single direction.

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Answer:

The field must be moving (C)

Compare and contrast what happens to an object's motion when balanced or
unbalanced forces act on that object.

Answers

Answer: The motions shifts.

A baby carriage is rolling down a hill at 18 m/s. If the carriage has 90J of kinetic energy, what is the mass of the carriage? a. 5 kg b. 0.56 kg c. 10 kg d. 100 kg​

Answers

Answer:

why did the parents let go of their child-

Explanation:

A 5 kg, because 90 / 18 is 5

The mass of the carriage is 10 kg

The formular for kinetic energy

K.E= 1/2mv²

Kinetic energy= 90 joules

velocity= 18 m/s

mass= ?

90= 1/2 × mass × 18

90= 0.5 × 18 × mass

90= 9 × mass

mass= 90/9

= 10 kg

Hence the mass of the carriage is 10 kg

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Help!!
Remember W = mg, 1 kg = 2.2 lbs. S
1) If you have a 12 lbs. bag of potatoes what is its mass? What is its weight?

Answers

Answer:

5.5 KG is the mass

53.9 is the Weight

Which are the basic physical sciences?

Answers

Answer:The four main branches of physical science are astronomy, physics, chemistry, and the Earth sciences, which include meteorology and geology.

Answer:

Chemistry, physics, astronomy and earth science.

Explanation:

The four main categories of physical sciences are chemistry, physics and earth science and astronomy. Life sciences deal with living organisms and behavioral sciences deals with the interactions between organisms in the natural world.

11. Which of the following is a proper unit of
acceleration?
A) s/km2
C) m/s2
B) km/h
D) cm/s

Answers

D is the correct answer!!

Answer:

I'm pretty sure it's c. I remember seeing a question like this and I think it was C

Explanation:

which type of mater conduct heat?​

Answers

Answer:

Copper is the best conductor

The best conductor would be copper.

what are factors that may affect the potential energy? (help)​

Answers

Answer:

The factors that affect an object's gravitational potential energy are its height relative to some reference point, its mass, and the strength of the gravitational field it is in.

Explanation:

hope this helps

The factors affecting potential energy of a body are mass, acceleration due to gravity, and height above the ground.

What is potential energy?

Potential energy is the energy that a body possess as a resulting its state or position relative to the ground.

Mathematically;

Potential energy = mass × acceleration due to gravity × height

Therefore, the factors affecting potential energy of a body are mass, acceleration due to gravity, and height above the ground.

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Will give Brainliest
What are the most important methods and instruments used to predict volcanic eruptions?

Answers

Hey are you good at grade 10 physics?
(EDM, Leveling, GPS, tilt) to detect and measure volcanic gases (COSPEC) to predict how much lava is moving underground,

Momentum is a product of mass and _____.

Answers

Answer:

Momentum, product of the mass of a particle and its velocity. ... Momentum is a vector quantity; i.e., it has both magnitude and direction. Isaac Newton's second law of motion states that the time rate of change of momentum is equal to the force acting on the particle.

Mass and it’s velocity

One of the goals of psychology is to predict future behavior or mental processes. Which of the following scenarios best illustrates this goal?
A.
The psychologist measures Michael’s heart rate and bodily functions to better describe his behavior.
B.
The psychologist helps Michael develop strategies to manage his anxiety levels so he can focus on the game.
C.
The psychologist tells Michael that his basketball performance will improve when his anxiety levels are moderated.
D.
After careful research, the psychologist explains that Michael’s intense feelings of anxiety are hindering his basketball performance.

Answers

The statement 'the psychologist tells Michael that his basketball performance will improve when his anxiety levels are moderated' best illustrates an objective of psychology (Option C).

Psychology is a discipline that studies human behavior through the mind.

The major objectives of psychology include describing, explaining, predicting, and modifying specific behaviors.

Anxiety is one of the main focuses in physiology and there are many psychological treatments aimed at modifying this particular behavior.

In conclusion, the statement 'the psychologist tells Michael that his basketball performance will improve when his anxiety levels are moderated' best illustrates an objective of psychology (Option C).

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Answer:

Explanation:

C

The power in an electrical circuit is given by the equation P= RR, where /is
the current flowing through the circuit and Ris the resistance of the circuit.
What is the power in a circuit that has a current of 0.02 amps and a
resistance of 30 ohms?

Answers

Equation of power in a electrical circuit is given as:

[tex] \bf P = I^2R[/tex]

I → Current flowing through the circuit.

R → Resistance of the circuit

We need to calculate power when;

Current (I) = 0.02 A

Resistance (R) = 30 Ω

By substituting values in the equation, we get:

[tex] \rm \longrightarrow P = (0.02)^2 \times 30 \\ \\ \rm \longrightarrow P = 0.0004 \times 30 \\ \\ \rm \longrightarrow P = 0.012 \: W[/tex]

[tex] \therefore [/tex] Power in the circuit = 0.012 W

Function of nucleus ​

Answers

Answer:

The nucleus has very important roles to play. As it contains genetic material, it coordinates cell activities like protein synthesis and cell division.

Explanation:

How does a battery supply electrical energy to a circuit?
A. Chemical reactions in a battery cause positively and negatively
charged particles to separate and become concentrated at the
battery terminals.
B. Chemical reactions in a battery cause positively and negatively
charged particles to concentrate in the center of the battery.
C. The force of attraction between positively and negatively charged
particles generates electrical energy within the battery.
O
D. Negatively charged particles that are concentrated at the negative
terminal are repelled from one another, forcing them into a
conducting wire.
ko

Answers

Answer: A.

Explanation:

took the test just now

A battery supplies electrical energy to a circuit Chemical reactions in a battery cause positively and negatively charged particles to separate and become concentrated at the battery terminals. The correct option is A.

What is a chemical reaction?

A chemical reaction is a process in which one or more substances, also known as reactants are converted to one or more different substances, known as products. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products

Chemical reactions in a battery cause positively and negatively charged particles to separate and become concentrated at the battery terminals resulting in the transformation into electrical energy therefore the correct option is A.

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A balloon is launched straight upward and has a hang time of 14 s. (wow)
A.) What was the launching velocity of the balloon?
B.) How high did the balloon travel?
C.) How far did the balloon travel between t = 3 and t = 4 s?

Answers

Answer:

A) Vo = 137.34 [m/s]

B) Y = 961.38 [m]

C) y = 367.8[m] for t = 3 [s] and y = 470.88[m] for t = 4[s]

Explanation:

To solve this problem we must use the following equation of kinematics. We must keep in mind that the negative sign of the equation means that the acceleration of gravity acts in the opposite direction to the movement of the balloon.

A)

[tex]v_{f} =v_{o} -g*t[/tex]

where:

Vf = final velocity = 0 (the maximum hang time, maximum elevation)

Vo = initial velocity [m/s]

g = gravity acceleration = 9.81 [m/s²]

t = time = 14 [s]

0 = Vo - (9,81*14)

Vo = 137.34 [m/s]

B)

Now we use the following equation.

[tex]y=y_{o}+v_{o} *t -(\frac{1}{2} )*g*t^{2}[/tex]

where:

Yo = initial position = 0

Y = final position [m]

Vo = initial velocity = 137.34 [m/s]

Now replacing

Y = (137.34*14) - (0.5*9.81*14²)

Y = 961.38 [m]

C)

With the above equation, we can calculate the distances between t = 3 and t = 4 [s]

[tex]y=y_{o} +v_{o} *t - (1/2)*g*t^{2}[/tex]

y = (137.34*3) - (0.5*9.81*3²)

y = 367.8[m] for t = 3 [s]

for t = 4[s]

y =  (137.34*4) - (0.5*9.81*4²)

y = 470.88[m]

how can gravitational energy play an important part of my life

Answers

Answer:

Explanation:

Well, lets say you park your car on the top of a hill, gravitational energy prevents it from the car falling back. Or a snow pack, aka before a potential avalanche. Though gravity cannot keep it safe forever, gravitational energy keeps it from crashing asap. In this case, it gives you time to escape. Altogether, gravitational force keeps the earth in it's atmosphere.

Help!!!
Remember W = mg, 1 kg = 2.2
2) A car engine has a weight of 1500 N, what is it's mass and what is it's weight in lbs.?

Answers

Answer:

Mass is 152.95743

weight in ibs 3304.6914215069355 ibs

EXPLANATION:

1500 N = 152.95743 KG

152.95743 KG × 9.8 = 1498.982814

1 KG is 2.2 IBS

so

14o8.982814 is 3304.6914215069355

A projectile has an initial x-velocity of 4 m/s, and an initial y-velocity of 27.7 m/s. What is the range of the projectile

Answers

Answer:

I love yourself help yourself

which has a higher viscosity orange juice or chocolate syrup

Answers

chocolate syrup ............

PWEESE HELP
LOOK AT THE IMAGE BELOW

Answers

Answer: 2 m/s is the answer

Explanation:

Erica (39 kg ) and Danny (46 kg ) are bouncing on a trampoline. Just as Erica reaches the high point of her bounce, Danny is moving upward past her at 4.6 m/s . At that instant he grabs hold of her.

Answers

Answer:

V = 2.79 m/s

Explanation:

Momentum before = momentum after

Erica's momentum = 0

Danny momentum = 49 kg * 4.9 m/s = 240.1 kg-m/s

240.1 + 0 = (37 + 49) kg * V

86 V = 240.1

V = 2.79 m/s

__________ ___________ are movements you do to loosen up your joints.



A .Dynamic Stretches

B. Static Stretches

Answers

The answer is B! Hoped o helped !have gray day I did Clase de AP – Unidad 2 Hoy es el 18 de noviembre
1.A.1: Identify the main idea.
2.A.1: Identify and/or describe content and connections among cultural topics. 4.A.2: Deduce the meaning of unfamiliar words or expressions
5.A.3: Provide and obtain relevant information in spoken exchanges.
Pregunta esencial:
1. ¿Como defines la belleza?

Calentamiento
asignacion en Teams)
el 19 de noviembre (Escribe en la
• ¿Cuál es la importancia de la moda en la vida social de las personas?
¿Cual es el impacto de la moda en la economia del individuo?
Tema de la unidad: La belleza y la estética

Answer:

Dynamic stretches

Explanation:

Dynamic stretches are active movements where joints and muscles go through a full range of motion. When you do dynamic stretches you do not hold the stretch, instead you stretch with movement.

Assuming the speed of sound is 340 m/s, what is the most likely speed of the jet shown below?

A. 200 m/s
B. 500 m/s
C. 100 m/s
D. 340 m/s

Answers

Answer:

I am assuming C.

Explanation:

The speed of the jet will be 340.0 m/sec. It is found as the ratio of speed of sound and the refractive index.

What is an index of refraction?

The refractive index of a substance also known as the refraction index or index of refraction is a dimensionless quantity that specifies how quickly light passes through it in optics.

The given data in the problem is;

c is the speed of light=340 m/sec

n is the index of refraction of air =1.00273

V is the speed of the jet

The index of refraction is found as;

[tex]\rm n = \frac{C}{v} \\\\ \rm v = \frac{334}{1.00273} \\\\ v=33.07 \ m/sec[/tex]

The speed of the jet will be 340.0 m/sec.

Hence, option D is correct.

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A ball is thrown up into the air with the initial velocity of 18 m/s. A) How high does the ball go? B) Calculate the time needed for the ball to reach its max height.

Answers

Answer:

(a) h = 16.53 m (b) t = 1.83 s

Explanation:

Given that,

The initial velocity of a ball, u = 18 m/s

When it reaches to the maximum height, its final velocity v will be 0. Let it goes to a maximum height of h meters.

Finding t using first equation of motion as follows :

v = u +at

Here, a = -g and v = 0

[tex]t=\dfrac{u}{g}\\\\t=\dfrac{18}{9.8}\\\\t=1.83\ s[/tex]

The time needed for the ball to reach its max height is 1.83 s.

Let h is the maximum height. Using second equation of motion to find it :

[tex]h=ut-\dfrac{1}{2}gt^2\\\\h=18(1.83)-\dfrac{1}{2}\times 9.8\times (1.83)^2\\\\h=16.53\ m[/tex]

So, it will go to a maximum height of 16.53 m.

why is it better to hold a musical events or programs in the evening?

Answers

Answer:

sound travels faster in the night

Explanation:

sound travels fasted at night

Which of the following is true about light with a single wavelength?

1) It can be refracted
II) It cannot be dispersed
III) It can be reflected *

Answers

Answer:

It can be refracted

Explanation:

When a single wavelength wave which is known as a monochromatic light is passed from one transparent medium to the other, it can refract. This refraction can only be seen if the light enter the medium at some angle.

What is Isaac Newtons third law of motion? Explain?

Answers

Answer: His third law states that for every action, or force, in nature there is an equal and opposite reaction.

Explanation: Basically, if object A exerts a force on object B, then object B also exerts an equal and opposite force on object A. Hope it helps!

Answer:

His third law states that for every action (force) in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal and opposite force on object A.

Which statement best describes the difference between acceleration and velocity?



A. acceleration only shows a change in direction, but velocity shows a change in speed.
B .acceleration depends on direction, but velocity does not.

C. acceleration is a change in velocity, but velocity is speed in a given direction.

D. acceleration only shows change in speed, but velocity only shows a change in direction.

Answers

Answer:

C

Explanation:

acceleration is a change in velocity which means a time rate change in velocity but velocity is the time rate change in displacement

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