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Question: A boy in a wheelchair (total mass 50.5 kg) has speed 1.40 m/s at the crest of a slope 2.40 m high and 12.4 m long. At the bottom of the slope his speed is 6.50 m/s. Assume air resistance and rolling resistance can be modeled as a constant friction force of 41.0 N. Find the work he did in pushing forward on his wheels during the downhill ride.
Solve the above question and show each and every step of calculation.
At an air show a jet flies directly toward the stands at a speed of 860 kilometer per hour, emitting a frequency of 2800 Hertz, Find what frequency do they receive as the plane flies directly away from them
A point particle that has a charge of 18.5 µC is located at x = 0, y = 0 and a point particle that has a charge q is located at x = 14.8 cm, y = 0. The electric force on a point particle that has a charge of 7.4 µC at x = 29.6 cm, y = 0 is -(19.7)..
an experimenter adds 970 j of heat to 1.75 mol of an ideal gas to heat it from 10.0c to 25.0c at a constant pressure.
An object is placed to the left of a lens, and a real image is formed to the right of the lens. How far from the lens is the object
A marble moving 1.48 m/s rolls off the top edge of a 125. cm high table. How far from the base of the table did it strike the floor
when a 100ohm resistor is connected to a battery of emf e and internal resistance of r the battery delivers a power of
a spaceship moving away from earth at 0.67 c fires a particle beam toward earth with speed 0.74 c relative to the ship.
The men's world record for the shot put, 23.12 m, was set by Randy Barnes of the United States on May 20; 1990.If the shot was launched from 6 ft above the ground at an initial angle of 42degrees, what was its initial speed.
A parallel-plate capacitor has capacitance 3.50 µF. How much energy is stored in the capacitor if it is connected to a 9.00 V battery? If the battery is disconnected and the distance among the charged plates doubled, what is the energy stored?
q1. a potential difference of 87 mv exists between the inner and outer surfaces of a cell membrane. the inner surface
A train at rest emits a sound at a frequency of 1045 Hz. An observer in a car travels away from the sound source at a speed of 37 m/s.What is the frequency heard by the observer . What must be the result have been for the horizontal speed.
Neglect air resitance. Find rocket's kinetic energy when the rocket is 1000 km above Earth's surface. Illustrate what is the max heigh that the rocket reaches.
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