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3 years ago

When play stops in the game of hockey, to restart the action what is that called? (Hint: there are several points on the rink)

Physics

1 answer:

QveST [7]3 years ago

3 0

Answer:

Face - off

Explanation:

Face - off is a term used in ice hockey to start periods of play and also to restart the play/action after a previous stoppage.

This face - off involves two opposing players from the 2 opposing teams standing opposite each other at an approximate distance of one sticks blade with the game official dropping the puck between them. Thereafter, two players will then to try to gain possession of the puck.

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A system undergoing a power cycle develops a steady power output of 0.3 kW while receiving energy input by heat transfer at a ra

uranmaximum [27]

Answer:

The thermal efficiency is 43%.

The total amount of energy developed by work is 397 kW in one year.

Explanation:

Given that,

Power output = 0.3 kW

Heat energy = 2400 Btu/h = 0.703 kW

We need to calculate the thermal efficiency

Using formula of efficiency

$\eta=\dfrac{out-put}{in-put}$

Put the value into the formula

$\eta=\dfrac{0.3}{0.703}$

$\eta=0.43\times100$

$\eta=43\%$

The thermal efficiency is 43%.

(b). We need to calculate the total amount of energy

Using formula of energy

$E=0.43\times0.703\times60\times60\times365$

$E=397209.06\ J$

$E=397\ kW$

Hence, The thermal efficiency is 43%.

The total amount of energy developed by work is 397 kW in one year.

4 0

4 years ago

Images produced by a cathode ray tube result from induced emf True or false

3241004551 [841]

I'm not completely sure but i think it's false

8 0

3 years ago

If you had a known sample of a mineral whose density was 7.1 grams/ml and its volume was 15 ml. What is the mass of the mineral.

kow [346]

Answer:

<h3>The answer is 106.5 g</h3>

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

<h3>mass = Density × volume</h3>

From the question

volume = 15 mL

density = 7.1 g/mL

We have

mass = 7.1 × 15

We have the final answer as

Hope this helps you

6 0

3 years ago

While traveling along a highway a driver slows from 32 m/s and comes to a stop with an acceleration of -6 m/s2. How long did it

diamong [38]

Answer: 6s

Explanation:

Vs=32m/s speed at beginning of slowing down

Vf=0m/s stop speed

a= -6 m/s² acceleration

----------------

Use equation for acceleration :

a=(Vf-Vs)/t

a*t=Vf-Vs

t=(Vf-Vs)/a

t=(0-36)/-6

t=-36/-6

t=6 s

7 0

3 years ago

A ball with a mass of 2.89 kg bounces off of the ground. Just before it hits the ground, its velocity is 6.00 m/s in the downwar

White raven [17]

Answer:

30.46 kgm/s

Explanation:

According to conservation law of momentum, the magnitude of the impulse J that the ground gave the ball equals to the change in momentum of the ball before and after it hits the ground.

Before the hit, the ball velocity is 6m/s, so its momentum is 6 * 2.89 = 17.34 kgm/s

After the hit, the ball velocity is -4.54 m/s in the opposite direction, so its momentum is 2.89*(-4.54) = -13.12 kgm/s

So the change of momentum, and also the impulse is

17.34 - (-13.12) = 30.46 kgm/s

3 0

3 years ago