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Questions in physics
📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
📝 Answered - Which type of star cluster forms from tightly packed groups of older stars? A. binary B. eclipse C. globular D. open
📝 Answered - A bullet of mass m and charge q is fired towards a solid uniformly charged sphere of radius R and total charge +q. If it strikes the surface of sphere with speed u, find the minimum speed u, so that it can penetrate through the sphere. (Neglect all resistance forces or friction acting on bullet except electrostatic forces.) (a) \(\frac{q}{\sqrt{2\pi \epsilon_0 mR}}\) (b) \(\frac{q}{\sqrt{4\pi \epsilon_0 mR}}\) (c) \(\frac{q}{\sqrt{8\pi \epsilon_0 mR}}\) (d) \(\frac{\sqrt{3}q}{\sqrt{4\pi \epsilon_0 mR}}\)
📝 Answered - A solid rubber ball dropped from a certain height above a swimming pool takes 0.3 seconds to reach the surface of the water (stage 1). The ball enters the water and reaches its maximum depth after 0.2 seconds (stage 2). Air resistance is negligible. Which one of the following statements is TRUE? A. Both the mechanical energy and momentum of the ball are constant during both stages (0.5 seconds). B. Both the mechanical energy and momentum of the ball are constant during stage 1 (first 0.3 seconds). C. Only the mechanical energy of the ball remains constant during both stages (0.5 seconds).
📝 Answered - Select the two correct phrases to complete the sentence below: "Angular momentum, _______ resisting force of the gyro to external torque." Options: A. The high, the great B. Be high, be great C. Is highest, is greatest D. Is high, is great E. The higher the, the greater the
📝 Answered - Which statement accurately describes thermal energy? A. Thermal energy is a transfer of kinetic energy. B. Thermal energy is a measure of total kinetic energy. C. Thermal energy is the temperature of a single particle. D. Thermal energy is a flow of heat.
📝 Answered - Define an ideal simple pendulum. Show that its motion under certain conditions is simple harmonic. Derive an expression for its period.
📝 Answered - How much work do you need to do if you use a force of 3 Newtons to move a table 25 meters?
📝 Answered - A hot air balloon along with its basket and contents has mass M. It is descending at a constant acceleration a less than the acceleration due to gravity. When the content of mass m is released from the hot air balloon, it starts rising upwards with the acceleration of same magnitude a. What is the value of m? (A) \frac{\alpha}{M(a+g)} (B) \frac{2\alpha}{M(a+g)} (C) \frac{\alpha+g}{M\alpha} (D) \frac{2\alpha}{M(a+g)}
📝 Answered - If a lamp transforms 120 joules of energy into light and heat every 2 seconds, how much power does it use? A. 240 W B. 480 W C. 120 W D. 60 W
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