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3 years ago

7

Do all substances radiate heat

2 answers:

a_sh-v [17]3 years ago

6 0

I don't believe they do

FinnZ [79.3K]3 years ago

5 0

Nope they do not ;)))))

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What is a personified statement?

slamgirl [31]

Answer:

A statement about you

Explanation:

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3 years ago

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How can a magnetic field be used to create an electric current

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Electric current produces a magnetic field. This magnetic field can be visualized as a pattern of circular field lines surrounding a wire. One way to explore the direction of a magnetic field is with a compass, as shown by a long straight current-carrying wire in.

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3 years ago

Sergei tees off on a stationary hockey puck using his most powerful slap shot. If he can exert a force of 250 N on the 500 gram

ASHA 777 [7]

Answer: velocity = 50m/s

Distance moved=5m

Explanation:

Using the formula Ft=Mv i.e impulse= momentum

Where F= force ,t= time, M= mass, v = velocity

In this case we need to find v,

F,t,M are all given in the question.

Therefore, substituting the values we have

250N×0.1s=0.5kg×v. Mass=500g= 0.5kg

v=25/0.5= 50m/s

The distance the puck will move when it is on his stick.

D= Velocity × time

D=50m/s × 0.1s

D=5m

Goodluck...

8 0

3 years ago

HURRY WILL GIVE BRAINLIEST

andrey2020 [161]

The amount of energy needed to melt the ice is 1670 J

Explanation:

The amount of thermal energy needed to completely melt a certain amount of solid substance (already at melting point) is given by

$Q=m\lambda_f$

where

m is the amount of the substance

$\lambda_f$ is the specific latent heat of fusion of the substance

Here, the mass of the ice is

m = 5 g = 0.005 kg

And the specific latent heat of fusion of ice is

$\lambda_f = 334,000 J/kg$

Assuming that the ice is already at melting point, the thermal energy needed to melt the ice is

$Q=(0.005)(334,000)=1670 J$

Learn more about specific heat:

brainly.com/question/3032746

brainly.com/question/4759369

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8 0

3 years ago

You will need to use the Momentum Principle to do the first part of this problem, and the Energy Principle to do the second part

My name is Ann [436]

Answer

given,

Mass of satellite, m = 4500 kg

Mass of the earth, M = 6 x 10²⁴ Kg

Earth circular orbit radius, R = 9.3 x 10⁶ m

a) To find the speed of the satellite

we need to equate the gravitation force between earth and satellite with the centripetal force.

$\dfrac{GMm}{R^2}=\dfrac{mV^2}{R}$

$V = \sqrt{\dfrac{GM}{R}}$

$V = \sqrt{\dfrac{6.67\times 10^{-11}\times 6\times 10^{24}}{9.3\times 10^6}}$

V = 6559.89 m/s

b) Minimum amount of energy of satellite

$E = \dfrac{GMm}{r}-\dfrac{1}{2}mv^2$

$E =\dfrac{6.67\times 10^{-11}\times 6\times 10^{24}\times 4500}{9.3\times 10^6}}-\dfrac{1}{2}\times 4500\times 6559.89^2$

E = 9.68 x 10¹⁰ J

Minimum amount of energy require to move satellite is equal to E = 9.68 x 10¹⁰ J

3 0

4 years ago