Consider a bicycle wheel to be a ring of radius 30. cm and mass 1.5 kg. Neglect the mass of the axle and sprocket. If a force of 20. N is applied tangentially to a sprocket of radius 4.0 cm for 4
0 s, what linear speed does the wheel achieve, assuming it rolls without slipping?
7.11 m/s
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A square loop (length along one side = 20 cm) rotates in a constant magnetic field which has a magnitude of 2.0 T. At an instant when the angle between the field and the normal to the plane of the loop is equal to 20° and increasing at the rate of 10°/s, what is the magnitude of the induced emf in the loop?
A. 13 mV B. 0.27 V C. 4.8 mV D. 14 mV E. 2.2 mV
If atoms unite by transfer of electrons, they form
a. an organic compound. b. an ionic compound. c. a polar molecule. d. a covalent compound.
Suppose the barn shown here is 10 meters long and the pole is 11.5 meters long. What is the minimum velocity that the pole has to travel relative to the barn for someone standing in the barn to measure the pole's length to be 10 meters or less?
a. 1/4 of the speed of light. b. 1/2 of the speed of light. c. 80% of the speed of light. d. The speed of light c. e. 110% of the speed of light.
Is the TMA always greater than the AMA for a machine? Explain