A person must pull a rope 20 meters with a force of 200 N what is the work input?

What do safety features in a car do to protect us in a collision

A pitched ball is hit by a batter at a 45degrees angle and just clears the outfield fence, 98m away. Assume that the fence is at the same height as the pitch and find the velocity of the ball when it left the bat. Neglect air resistance.

Questions A bowling ball moves 18 meters every 2 seconds down the lane at a bowling alley. What is the speed of the bowling ball? A 18 meters per second B 9 meters per second C 2 meters per second D 36 meters per second

A physics professor demonstrates the Doppler effect by tying a 600 Hz sound generator to a 1.0-m-long rope and whirling it around her head in a horizontal circle at 120 rpm. Assume the room temperature is 20 degrees Celsius.

Two current carrying wires are parallel to one another and separated by 2cm. If the distance between them is increased to 4cm the new force will be what factor times the original force? a) 2 b) 4 c) ½ d) ¼ e) none of the above

A space probe produces a radio signal pulse. If the pulse reaches Earth 12.3 seconds after it is emitted by the probe, what is the distance from the probe to Earth?

Do substances that heat up quickly have high or low specific heat capacity?

A substance has a specific heat of 0.870 J/g°C. It requires 2,000.0 joules to increase the temperature of 10.0 grams of the substance from its original temperature to its final temperature. By how many degrees did the substance increase? A 87.

How many earth years does it take mars to orbit the sun

Which represents a system that is almost completely closed?