4 years ago

A player kicks a ball across the grass. what causes the ball to slow down to stop

1 answer:

7 0

Answer: Friction

Explanation: Friction caused m by the ball rubbing against the grass and ground cause it to lose energy in the form of thermal energy and slow down

You might be interested in

Which statement describes the relationship of resistance and current?

Len [333]

Choices 'B'; and 'D' both begin with the correct words.
But they should end with the equation

R = V / I

8 0

3 years ago

Read 2 more answers

Which of the following is true regarding the Earth's mantle?

Brilliant_brown [7]

B) It’s material moves due to convection currents.

6 0

3 years ago

A heat pump is to be used for heating a house in winter. The house is to be maintained at 70°F at all times. When the temperatur

Anna35 [415]

Answer:

$\dot{W_{H} } = 4244.48 Btu/h$

Explanation:

Temperature of the house, $T_{H} = 70^{0} F$

Convert to rankine, $T_{H} = 70^{0}+ 460 = 530 R$

Heat is extracted at 40°F i.e $T_{L} = 40^{0}F = 40 + 460 = 500 R$

Calculate the coefficient of performance of the heat pump, COP

$COP = \frac{T_{H} }{T_{H} - T_{L} } \\COP = \frac{530 }{530 - 500 }\\ COP = \frac{530}{30} \\COP = 17.67$

The minimum power required to run the heat pump is given by the formula:

$\dot{W_{H} } = \frac{\dot{Q_{H} }}{COP} \\$ ...............(*)

Where the heat losses from the house, $\dot{Q_{H} } = 75,000 Btu/h$

Substituting these values into * above

$\dot{W_{H} } = \frac{75000}{17.67} \\ \dot{W_{H} } = 4244.48 Btu/h$

3 0

3 years ago

Referring to the map of the temperature field in the room, where was the warmest field found?

klasskru [66]

Is there supposed to be an image if so there is none

8 0

3 years ago

Read 2 more answers

How is air pressure related to elevation?

exis [7]

Air pressure decreases with altitude

hope that helps you!

6 0

3 years ago