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Starting from rest at the top of a tall, steep ramp, a sphere rolls without slipping to the ground 6.9 m below. At the bottom, its speed is 9.0 m/s. Question The sphere is either solid or hollow: which is it? Physics Assume that air resistance is negligible, and that the sphere's total mechanical energy is conserved. The fact that it's rolling without slipping means it has two kinds of kinetic energy; be sure to account for both. It also means there is a definite relationship between its rotational and linear speeds.
Two charged bodies exert the force of 0.185N on each other. If they are moved so that they are one-fourth as far apart, what force is exerted.
A military gun is mounted on a railroad car (m = 1400 kg), Find the recoil velocity of the car
A person shoots a tennis ball out of a launcher. The tennis ball rises to a maximum height of 38 meters. a. What is the initial velocity of the tennis ball out of the launcher
A car is being pulled out of the mud by two forces that are applied by the two ropes shown in the drawing. The dashed line in the drawing bisects the 30.0° angle.
A long solenoid has 1400 turns per meter of length, and it carries a current of 3.5 A. Find the torque exerted on the coil
A 83.0 kg fullback is running at 3.86 m/s to the east and is stopped in 0.760 s by a head-on tackle by a tackler running due west. Calculate the impulse exerted on the fullback.
The mass of an electron is 9.11*10^-31kg. What is the mass of one negative coulomb electron
You land on a spherical asteroid and take a walk for 3km. You notice that the stars ahead of you rise 36 degrees as you walk
An elevator cable can withstand a maximum tension of 19,500N before breaking. The elevator has a mass of 480 kg and a maximum acceleration of 2.24 m/s2. Engineering safety standards require that the cable tension never exceed two-thirds of the breaki..
Water is flowing through a pipe with a constriction. The area of the narrow section is one-half the area of the wide section. what is the velocity of the fluid in the narrow section
A river that is 207 m wide flows due east at a uniform speed of 1.9 m/s. What is the magnitude of the boat's velocity
A car accelerates from rest at a constant rate of 2.0 m/s^2 for 5.0 s. What is the speed of the car at the end of that time
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