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Question1
A 50-kg student on a sled starts from rest at a vertical height of 20 m above horizontal base of a hill and slides down. a) If sled and the student have a speed of 10 m/s at the bottom of the hill, this system is
(1) conservative, (2) non-conservative, or (3) none of the preceding. Why give reasons?
b) What is work done by the non-conservative force?
Question2
Conceptual provides useful background for this problem. A playground carousel is free to rotate about its center on frictionless bearings, and air resistance is negligible. The carousel itself (without riders) has a moment of inertia of 125 kg·m2. While one person is standing on the carousel at a distance of 1.50 m from center, the carousel has the angular velocity of 0.600 rad/s. yet, as this person moves inward to a point located 0.938 m from the center, the angular velocity increases to 0.800 rad/s. What is person’s mass?
compute the electric flux through a rectangular plane.
A simple circuit is set up that only consists of a 12 V battery connected to a light bulb with a resistance of 4 Ohms. What current flows through the light bulb
A wheel of radius 30 cm is rotating at a rate of 2.0 revolutions every 0.080 s. What is the wheel's frequency of rotation
A person swimming underwater sees a lifeguard who is standing in the shallow part of the pool; the water comes up to the lifeguard's waist. In what way does the swimmer see lifeguard's upper body distorted.
A 7.0 L volume of ideal neon gas (monatomic) is at a pressure of 4.3 atmospheres and a temperature of 400 K. determine the final pressure of the gas
A 5 kg ball collides head-on with a 10 kg ball, which is initially stationary. The collision is inelastic. Which statement is true?
A U-shaped tube open to the air at both ends contains some mercury with a density of 13,600 kg/m3. Calculate the gauge pressure at the water-mercury interface
A 3.0 m tall, 64 cm diameter concrete column supports a 205,000 kg load. By how much is the column compressed
A player uses a hockey stick to increase the speed of a 0.200 kg hockey puck by 6m/s in 2 seconds. how much force was exerted on puck? how much on the stick.
Illustrate what should be the other mass so that the displacement of either mass during the first second following release is 0.34 m? Assume a massless, frictionless pulley and a massless string.
A 1.02mF capacitor is connected in series with an AC source with amplitude 50V and angular frequecy 40 rad/s. determine the amplitude of the current through this circuit
A diver makes 0.50 revolutions on the way from a 9.9-m-high platform to the water. find the diver's average angular velocity during a dive
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