2 years ago

Endothermic reactions give off heat as they proceed. a. True b. False

Physics

1 answer:

Temka [501]2 years ago

5 0

B. False
Endothermic reactions absorb heat.

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A weather forecaster uses Doppler radar to predict the track of a storm near the town of hillville when the Doppler signal is he

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Answer: That the storm is moving toward hillville and that residents should be prepared.

Explanation:

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2 years ago

A 45.00 kg person in a 43.00 kg cart is coasting with a speed of 19 m/s before it goes up a hill. there is no friction, what is

HACTEHA [7]

Answer:

the maximum vertical height the person in the cart can reach is 18.42 m

Explanation:

Given;

mass of the person in cart, m₁ = 45 kg

mass of the cart, m₂ = 43 kg

acceleration due to gravity, g = 9.8 m/s²

final speed of the cart before it goes up the hill, v = 19 m/s

Apply the principle of conservation of energy;

$mgh_{max} = \frac{1}{2}mv^2_{max}\\\\ gh_{max} = \frac{1}{2}v^2_{max}\\\\h_{max} = \frac{v^2_{max}}{2g} \\\\h_{max} =\frac{(19)^2}{2\times 9.8} \\\\h_{max} = 18.42 \ m$

Therefore, the maximum vertical height the person in the cart can reach is 18.42 m

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2 years ago

A school bus moves slower and slower. Using what you have learned about forces, explain why the bus moves slower and slower.

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Explanation:

the weight of the people inside the bus

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2 years ago

11)<br> In which state of matter has the LEAST kinetic energy?

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Solid particles hope this helped!

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1 year ago

A cart is pulled by a force of 250 N at an angle of 35° above the horizontal. The cart accelerates at 1.4 m/s2. The free-body di

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Answer:

m=146.277kg which is rounded to 146kg

Explanation:

Remember that F=ma

But F represents not 250N, but 250cos(35)N since the force is being pulled above the horizontal.

So 250cos(35)=204.7880111 approximately, and since a=1.4m/s^2, we have 204.7880111=m(1.4m/s^2). Then we divide both sides by the acceleration to get the mass. So m=146.2771508kg which the nearest number is 146kg

Mass is always in kg, unless stated otherwise.

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2 years ago

Read 2 more answers