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In comparing traditional low-speed chairlifts with high-speed chairlifts, assumptions have been made that the energy lost (efficiency) between the two chairlifts is the same if they travel the same distance. Explain why this assumption is false.
An electron and a proton are located a distance of 10-10 m apart and are both momentarily at rest. What electrostatic force does the electron feel due to the proton
Transverse waves on a string have wave speed v=8m/s , amplitude A=0.0700 m , and wavelength lambda= 0.320 m . The waves travel in the -x direction, and at t = 0 the x = 0 end of the string has its maximum upward displacement.
A soccer playrer kicks a 0.5kg ball from rest to a speed of 9m/s during a 0.15s contact between his foot and the ball. What is the average force applied by the players foot during the kick
A massless spring hangs from the ceiling with a small object attached to its lower end. The object is initially held at rest in a position yi such that the spring is at its rest length. The object is then released from yi and oscillates up and dow..
The Apollo astronauts returned from the moon under the Earth's gravitational force and reached speeds of almost 25,000 mi/h with respect to Earth. Assuming (incorrectly) they had this speed for the entire trip from the moon to Earth, what was the ..
Two billiard balls move at right angles and meet at the origin. After the collision, ball B is moving along the positive y axis at 2.85 m/s. What is the final velocity & direction of Ball A?
Consider an object of Mass M = 7.50 kg object placed on a horizontal rough surface (?s = 0.400 and ?k = 0.300) initially at rest. A force F is applied.
A driver in a car travelling at the speed of 78 km/h sees a cat km away on the road. How long will it take for the car to accelerate uniformly to a stop in exactly 99 m.
A 19.5 ?F capacitor is fully charged by connecting it to a 14.0 V battery. Calculate the charge stored on one of the capacitor plates
A centrifuge in a medical laboratory rotates at a rotational speed of 3600rev/min. when switched off, it rotates 50.0 times at a constant angular acceleration before coming to rest.
Radiation of intensity 1.00 kW/m2 is incident on an area perpendicular to the incoming light. What is the resulting power per unit area now reaching the surface
A sports car with a mass of 1000 kg crashes into the rear an SUV with amass of 2400 kg that is stopped at a RED light. The bumpers lock and two cars skid forward a distance of 3 meters before coming to a stop. if the coefficient of kinetic friction i..
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