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4 years ago

Plz help with all of them! Read instructions. I will give you 30 points. No Joke.

Physics

1 answer:

blondinia [14]4 years ago

3 0

The coolant gas in a fridge takes heat from the fridge and "pumps" or "dumps" it in the outside. The back of a working fridge is usually quite warm, and one source of that heat is the contents of the fridge.
<span>Electrical energy is used to pump the coolant round the various components of the fridge's cooling system. It also possibly powers any lights in the fridge. That funny whirring sound may well be a motor, and motors are driven by electrical energy. If your power goes off, then your fridge stops fridging. all the stuff in the fridge warms up to room temp slowly, and you may end up with some "too warm" grub.</span>

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An object accelerates from rest with a constant acceleration of 2 m/s2. How far will it have moved after 9s?

maw [93]

As per the question the, the initial velocity of object [u] =0

The acceleration of the block $[a]=2\ m/s^2$

The time taken by the object[t] = 9 s.

We are asked to calculate the distance travelled by the object in that time.

As per equation of kinematics we know that-

$s=\ ut+\frac{1}{2} at^2$

Here s is the distance travelled by the object.

$=0*9+\frac{1}{2} 2*[9]^2\ m$

$=81\ m$ [ans]

5 0

4 years ago

Which of the following describes the way heat is transferred in a geyser?

Lunna [17]

Where’s the following questions ?

4 0

3 years ago

What did Rutherford conclude from the motion of the particles when shot through a thin gold foil

Kipish [7]

Answer:

He concluded the fact that most alpha particles went straight through the foil is evidence for the atom being mostly empty space. A small number of alpha particles being deflected at large angles suggested that there is a concentration of positive charge in the atom.

Explanation:

3 0

3 years ago

When a body falls to the earth, the earth also move up to meet it but the earth motion is not noticeable. why?

viva [34]

It is because earths mass is very large so its movement isnt noticibale

7 0

3 years ago

A 75-kilogram hockey player is skating across the ice at a speed of 6.0 meters per second. What is the magnitude of the average

saveliy_v [14]

Answer:

(3) 690 N

Explanation:

Force: This is the product of mass and acceleration of a body. The S.I unit of force is Newton(N).

The formula for force is given as,

F = ma..................... Equation 1

Where F = force, m = mass, a = acceleration.

Also,

a = (v-u)/t................... Equation 2

Where v = Final velocity, u = initial velocity, t = time.

Given: u = 6.0 m/s, v = 0 m/s (bring to stop), t = 0.65 s.

Substitute into equation 2

a = (0-6)/0.65

a = -6/0.65

a = -9.23 m/s²

Also given: m = 75 kg

Substitute again into equation 1

F = 75(-9.23)

F = -692.25 N

The negative sign tells that the force oppose the motion of the player

F ≈ 690 N

Hence the right option is (3) 690 N

3 0

3 years ago