A log has a density of. 8 g/cmÂł. What will happen to this log in freshwater, which has a density of 1. 0 g/cmÂł? It will sink. It will float. It will move deeper. It will decrease in density.

Answers

Answer 1

When a log of wood is put over the freshwater, the log start to float. Option B is correct.

Density:

It can be defined as the amount of substance per unit volume. It is usually denoted by D. It is measured in the [tex]\bold { kg/m^3}[/tex].

The less dense object always floats over the more dense substance.

For example- Here, The density of the log is 0.8 [tex]\bold{ cm^3}[/tex] and the density of the of water is 1.0 [tex]\bold{ cm^3}[/tex] .

Since, the density of the log is lesser than the density of the water.

Therefore, when a log of wood is put over the freshwater, the log start to float.

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Related Questions

A medieval instrument used to determine the position of the sun:

Answers

Answer: astrolabe

Explanation:

Explain why the formation of sand is a physical change.

Answers

In chemical changes new substances are formed and the process is often difficult to reverse. During chemical changes particles do change with atoms or ions regrouping.Bonds between atoms break and new ones
form and energy is either given out or
taken in. Some chemical changes are
initiated by mixing

Answer:

The formation of sand is a physical change because some of the physical properties of the rocks change, but their identities do not. The particles of rock are rearranged as their sizes and shapes change, but their identities and total mass remain the same.

help will give brainlist
Which unit is used for current?
power
resistance
voltage
amperes

Answers

The answer is D amperes

1 point
A hairdryer uses 10 A of current when plugged into a 120 V outlet. How
much power does it use?

Answers

Answer:

1200 watt

Explanation:

P= I*V=10*120=1200watt

What is the average speed of a car that travels 30 m in the 3 secs and 2 m 4 secs and 20 m 5 secs

Answers

Answer:

4.3333333

Explanation:

total distance / total time taken

30 + 2 + 20 / 3 + 4 + 5

52 / 12

4.3 recurring

Two boats race in the water. One turns around to head back in the other direction to complete the race, but it collides into the boat that was now directly in front. What forces may have been a part of the collision? Describe them in detail.

Answers

The two forces involved in this collision are the colliding force and the reaction force which are equal in magnitude but opposite in direction.

According to Newton's third law, action and reaction are equal and opposite. This law is very important in describing head - on collisions between objects and is particularly apt in describing the collision between the two boats.

In this collision, two forces are important these are the action and the reaction. The action is the colliding force which the boat that was hit experiences. The reaction force is the force that this boat experiences as a result of hitting the boat in front of it. The both forces are equal in magnitude but opposite in direction.

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1. How much energy is needed just to melt 0.56kg of ice at 0◦ C?
2. How much energy is needed just to boil 5kg of water at 100◦ C?
3. What is the specific heat of metal if its mass is 27 g and it requires 420 J of heat energy to
increase its temperature from 25°C to 50°C?


please help me out I dont have much time

Answers

Answer:

This will require 266.9 of heat energy.

Explanation:

To calculate the energy required to raise the temperature of any given substance, here's what you require:The mass of the material, m The temperature change that occurs,  ΔT The specific heat capacity of the material,

c

(which you can look up). This is the amount of heat required to raise 1 gram of that substance by 1°C.

Here is a source of values of

c for different substances:

Once you have all that, this is the equation:

Q=m×c×ΔT(Q is usually used to symbolize that heat required in a case like this.)For water, the value of c is 4.186g°C So, Q=750×4.186×85=266=858=266.858

A firecracker is placed in the middle of a room. When the firecracker explodes the parts of the firecracker scatter in all different directions. The total combined momentum of all the parts of the firecracker added together after the explosion must be



A.
more than before the explosion.

B.
less than before the explosion.

C.
can not tell from the given information

D.
the same as before the explosion.

Answers

Because momentum is a vector quantity, the total combined momentum of all the parts of the firecracker added together after the explosion must be the same as before the explosion. The correct answer is D

Given that a firecracker is placed in the middle of a room. This means that the firecracker is at rest. That is its momentum is equal to zero. When the firecracker is lit up, it will move in a certain velocity before it explodes. Since the total combined momentum of all the parts of the firecracker scatter in all different directions are considered, that is added up, then momentum will always be conserved. That is,

The momentum of an object before explosion will always be equal to the momentum of the object after explosion.

Because momentum is a vector quantity, in which we must consider it magnitude and direction, the best answer to this question is option D.

That is,

The total combined momentum of all the parts of the firecracker added together after the explosion must be the same as before the explosion

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PLEASE HELP!!

NEED THIS IMMEDIATELY TODAY

NO LINKS

I WILL GIVE YOU BRAINLIEST IF YOU HELP ME!!

PLEASE HELP ASAP REALLY NEED THIS!!

(answer choices: applied force, normal force, friction, electrical force, magnetic force and gravitational force)

(question in picture)

Answers

Answer:

3

Explanation:

because they are pushing a body

what is the velocity of 8.01

Answers

Answer: The velocity of what?

A train starts at rest and ends up with 1500 J of kinetic energy. How much work was done on the train?

Answers

Answer:

  1500 J

Explanation:

Apparently, we're to assume that no energy is lost to friction or other effects. Then all of the energy the train has is due to work being done on it.

  1500 J of work was done on the train

A car travels 120 miles in 12 hours. What is
the car's speed?

Select one:
O a. 10 m/s

b. 10 mph

c. 1200 mph

O d. 0.1 m/s

Answers

Answer:

I hope it will help you...

#CARRYONLERANING

A 2.6 kg mass attached to a light string rotates on a horizontal,
frictionless table. The radius of the circle is 0.525 m, and the
string can support a mass of 17.9 kg before breaking. The
acceleration of gravity is 9.8m/s2. What maximum speed can
the mass have before the string breaks?

Answers

The maximum speed the mass can have before it breaks is 2.27 m/s.

The given parameters:

maximum mass the string can support before breaking, m = 17.9 kgradius of the circle, r = 0.525 m

The maximum speed the mass can have before it breaks is calculated as follows;

[tex]T = ma_c\\\\Mg = \frac{Mv^2}{r} \\\\v^2 = rg\\\\v = \sqrt{rg} \\\\v_{max} = \sqrt{0.525 \times 9.8} \\\\v_{max} = 2.27 \ m/s[/tex]

Thus, the maximum speed the mass can have before it breaks is 2.27 m/s.

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An object is dropped from a building and strikes the ground with a speed of 52 m/s. How tall is the building?

Answers

Answer:

5.3 0 meter is the hight of the building is it

The body weighs 15N. What is the mass of that body?

Answers

The equation you can use to find the mass is:

Weight = mass x gravity

Where you can rearrange the equation to find the mass.

Mass = weight/gravity

The known values are:
Weight = 15
Gravity = 9.81

Substitute the known values into the equation.

Mass = 15/9.81

Mass = 1.53kg (rounded to 2dp)

A 40 N block is resting on a rough inclined plane. The static friction between the block and the plane is ____ N.​

Answers

The static friction between the block and the plane is [tex]40(\mu_s) \ N[/tex].

The given parameters:

Weight of the block, W = 40 N

The normal reaction on the rough surface due to weight of the block is calculated as follows;

[tex]F_n = 40 \ N[/tex]

The static friction between the block and the plane is calculated as follows;

[tex]F_s = \mu_s F_n[/tex]

where;

[tex]\mu_s[/tex] is coefficient of static friction

Thus, the static friction between the block and the plane is [tex]40(\mu_s) \ N[/tex].

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12. Since the Clean Air Act was passed in 1970, why is the air still not clean?

Answers

Answer:

Congress designed the Clean Air Act to protect public health and welfare from different types of air pollution caused by a diverse array of pollution sources.

Explanation:

If there were no dark energy in the universe, the value of __________ would solely determine the evolution and fate of the universe.

Answers

Answer:

Ωmass

Explanation:

If there were no dark energy in the universe, the value of Ωmass would determine the evolution and fate of the universe.

pls help quickly

Which of these materials best scatters the light that strikes it?
a pure water
b shiny mirror
c frosted glass
d eyeglass lens

Answers

Answer: frosted glass

Explanation:

Answer:

C

Explanation:

Frosted Glass

Name the two sources of light.​

Answers

Answer:

Natural light (Sun, stars.etc.) and Artificial light (Lamposts, televisions.etc.)

Hope that helps. x

mrs. knight drops her briefcase. when the briefcase lands on the floor, what is the reaction force to the action force of the briefcase on the floor?

Answers

Answer:

The force of the floor on the briefcase

Explanation:

The briefcase hits the floor and stops the falling which is reacting to the briefcase that was falling and hits the floor.

The falling briefcase would be the action force because it is moving downward

and

The reaction force would be the floor because it will react on the briefcase.

Hope this Helps

When the briefcase lands on the floor, the reaction force to the action force of the briefcase on the floor is  force of the floor on the briefcase.

What are action force and reaction force?

It might be difficult to distinguish between action and reaction forces. This is due to the fact that both forces are always present.

One might argue that there are an equal number of forces in the universe if one were to count them all. However, the definition of the action force is provided by the perspective of the interaction analysis in order to help the argument.

A force that is applied to an object is known as an action force.

An action force with an opposite direction has an effect called a reaction force.

These two forces—also referred to as action and reaction forces—are covered by Newton's third law of motion.

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a -0.06 C charge is placed in a uniform electric field with a strength of 200 N/C. what is the magnitude and direction of the force on the charge​

Answers

The  magnitude and direction of the force on the charge​ is -12 N opposite the electric field

To calculate the force on a charge in an electric field, we make use of the formula below.

Formula

F = E×Q .......................... Equation 1

Where:

F = Force on the chargeE = Electric FieldQ = charge

From the question,

Given:

E = 200 N/CQ = -0.06 C

Substitute these values into equation 1

F = 200(-0.06)F = -12 N

Note: The negative sign indicates that the force is in the direction negative of the electric field.

Hence, The  magnitude and direction of the force on the charge​ is -12 N opposite the electric field

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Answer: A edge 202694020

Explanation:

Share your thoughts about this statement by John Wesley
"Electricty is the soul of universe"

Answers

Answer:

I think this statement is true at least in modern day times. The world runs on nothing but technology. People use more technology instead of old school textbooks and papers. Imagine living in a world without technology… that means no cars, no trains, no devices, no machines like your stove or printer, no lights and lots more. John Wesley is 100 percent correct with this statement. Electricity is indeed the powerhouse of the universe.


A woman of mass 49 kg jumps off the bow
of a 78 kg canoe that is intially at rest.
If her velocity is 4.5 m/s to the right, what
is the velocity of the canoe after she jumps?
Answer in units of m/s i.
x x

Answers

The woman-canoe system has zero initial momentum. When the woman jumps from the canoe, the total momenta of the woman and canoe is conserved, so that

0 = (49 kg) (4.5 m/s) + (78 kg) v

where v is the velocity of the canoe. Solving for v, we find

(78 kg) v = - (49 kg) (4.5 m/s)

v = - 49/78 (4.5 m/s)

v ≈ -2.8 m/s

which is to say, the boat is given a velocity of 2.8 m/s to the left.

If an atom has two protons and three electrons, then the atom is-?
A. positively charged.
B. negatively charged.
C. radioactive.
D. neutral.

Answers

Before solving this question, one has to remember the following facts.Protons are positively charged particles in an atom.Electrons are negatively charged particles in an atom.If protons are greater than electrons, then the atom is positively charged.If electrons are greater than protons, then the atom is negatively charged.If both are equal, then the atom is in neutral state.Here, the number of protons = 2Number of electrons = 3.Since, number of protons < number of electronsTherefore, the atom is negatively charged.

Hope you could get an idea from here.

Doubt clarification - use comment section.

Convert: 12 km/hr =
m/s

Answers

[tex]12~ \text{km} ~ \text{h}^{-1} = \dfrac{12 \times 1000}{3600} ~~ \text{m s}^{-1} = 3.33 ~~ \text{m s}^{-1}[/tex]

Answer:

3 1/3 or 3.3333....

Explanation:

You multiply the kilometres by 1,000 because there are 1,000 metres in a kilometre. Then you divide by 60 because there are 60 minutes per hour, and then again by 60 because 60 seconds per minute.

12,000 / 60 = 200

200 / 60 = 3.333

A furniture crate of mass 60 kg is at rest a loading ramp that makes an angle of 25° with the horizontal
The coefficient of kinetic friction between the crate and the ramp is 0.2. What force, applied parallel to the incline, is required to push the crate up the incline at a constant speed?

Answers

Answer:

furniture crate of mass 60 kg is at rest a loading ramp that makes an angle of 25° with the horizontal

The coefficient of kinetic friction between the crate and the ramp is 0.2. What force, applied parallel to the incline, is required to push the crate up the incline at a constant speed?

Explanation:

furniture crate of mass 60 kg is at rest a loading ramp that makes an angle of 25° with the horizontal

The coefficient of kinetic friction between the crate and the ramp is 0.2. What force, applied parallel to the incline, is required to push the crate up the incline at a constant speed?

[tex] \huge \boxed{ \sf lol}[/tex]

What is centripetal force and elastic force

Answers

Answer:

centripetal force is a net force that acts on an object to keep it moving along a circular path and elastic force acts to return a spring to its natural length

What is the magnitude of the resultant of
a 3.0-
meter displacement and a 4.0-meter
displacement as shown in the diagram?
A. 1.0 meter
4.0 meters
B. 5.0 meters
3.0 meters
C. 7.0 meters
D. 12 meters

Answers

Answer:b. 5.0 meters

Explanation: d² = 3²+4²

d² = 9+16

d² = 25

d = √25

d = 5m

The magnitude of the displacement is 5 m as shown in the diagram. Option B is correct.

What is displacement?

Displacement can be defined as the total change in the position of the object. It is a vector quantity.

From the Pythagorean theorem,

[tex]d =\sqrt { 3^2 +4^2}\\\\d = \sqrt {25}\\\\d = 5[/tex]

Therefore, the magnitude of the displacement is 5 m.

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Please help someone. A generator consumes 147 joules of energy in fuel and produces 75 joules of energy
in electricity. Engineers are challenged to produce a generator that is 20% more
efficient. Which of the following combinations of input and output energy represents a generator that has met this design challenge?
a. 150 joules of fuel to produce 90 joules of electricity
b. 135 joules of fuel to produce 68 joules of electricity
c. 60 joules of fuel to produce 100 joules of electricity
d. 115 joules of fuel to produce 82 joules of electricity

Answers

Answer:

A

Explanation:

Current effiency

= 75/147

= 0.5102

New Efficiency

= 120/100 × 0.5102

= 0.6122

Only option A satisfies this efficiency.

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