R₁ = 10.0 k, R₂ = 15.0 k, C=0.400 μF, and the ideal battery has emf E=20.0 V. First, the switch is closed a long time so that the steady state is reached. voltage across the capacitor in the steady-state condition is 12V. Suppose the switch is opened at time t=0. What is the charge on the capacitor at t = 4.00 ms?
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- 13. 54-kg box is sitting on the floor of a level railroad car which is moving forward with a speed of 25 m/s and accelerating at a rate of 5.6 m/s2. What is the strength, in Newtons, of the frictional force acting on the box if it does not slide on the floor? O A. 0 O B. 25 N O C. 54 N O D. 248 N O E. 255 N O F. 302 N O G. 520N O H. 1350 N Back Save & Continue 2020 BYU 99+A child of mass 43 kg stands on a scale inside an elevator. Select one or more: A. The scale would show his weight as 335.40 N when the elevator accelerates downward at 2 m/s2. B. The scale would show his weight as 507.4 N when the elevator accelerates upward at 2 m/s2. C. The scale would show his weight as 335.40 N when the elevator accelerates upward at 2 m/s2. D. The scale would show his weight as 335.40 N when the elevator decelerates upward at 2 m/s2. E. The scale would show his weight as 421.4 N when the elevator is stationary. F. The scale would show his weight as 335.4 N when the elevator decelerates upward at 2 m/s2. G. The scale would show his weight as 421.40 N when the elevator moves with a constant velocity of 2.5 m/s.15. A skier is at the top of a frictionless hill. The hill makes an angle of 30.0° relative to the horizontal. What would be her acceleration down the hill? A. 2.9 m/s² B. 4.9 m/s² C. 3.3 m/s2 D. 3.8 m/s² E. 8.5 m/s²
- A 70.0-kg man is standing on a scale in an elevator that is accelerating upward at a rate of 2.00 m/s2. What will the scale read? a. 686 N b. 900 N c. 980 N d. 726 N e. 826 NA man of weight 80 kg is standing in an elevator which is moving with a constant velocity of 6 m/s in downward direction. The apparant weight of a man will be (take g=10 m/s^2) A. 1280 N B. 0 N C. 320 N D. 800 N E. 640 NHow much would an 80.0 kg person weigh on Mars, where the acceleration of gravity is 3.93 m/s^2. a. 0.05 N c. 83.93 N b. 20.36 N d. 314.40 N
- The weight of the rock is 76N. An upward force of 106N is exerted on the rock. What is the net force acting on the rock? A. 76 N downward B. 30 N upward C. 182 N downward D. 106 N upwardIt takes the elevator in a skyscraper 4.0 s to reach its cruising speed of 10 m/s. A 60 kg passenger gets aboard on the ground floor. What is the passenger’s apparent weighta. Before the elevator starts moving?b. While the elevator is speeding up?c. After the elevator reaches its cruising speed?A person of weight 490 N stands on a scale in an elevator. What will the scale be reading? when the elevator is accelerating downward at 6 m/s² A. 190N В. 790N С. 490N D. Zero В O D O A
- 3. The mass of a particle is 18 kg. a. What is its weight on Earth? b. What is its weight on the Moon? c. What is its mass on the Moon? d. What is its weight in outer space far from any celestial body? e. What is its mass at this point?10. If two objects are dropped in an environment without air resistance, what will occur? Both of the objects will fall with constant velocity O The lighter of the two objects will fall faster than the heavier. O The heavier of the two objects will fall faster than the lighter. O The objects will accelerate downward at the same rate.5. A mass of 10kg sits on a level surface. One end of the surface is raised until the block begins to slide down the ramp at a constant velocity and angle of 20⁰. c. What is the Normal Force, N? d. What is the Frictional Force, Ff?