A skater is using very low-friction rollerblades. A friend throws a Frisbee at her, on the straight line along which she is coasting. Describe the following event as an elastic, an inelastic, or a perfectly inelastic collision between the skater and the Frisbee. She catches the Frisbee and immediately throws it back with the same speed (relative to the ground) to her friend
1.elastic
2.inelastic
3.perfectly inelastic
2
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The condition for interference maxima for a diffraction grating is identical to that for
A) a narrowing single slit. B) a double slit. C) a thin film. D) a wide single slit.
When a car goes around a circular curve on a level road without slipping,
a. no frictional force is needed because the car simply follows the road. b. the frictional force of the road on the car increases when the car's speed decreases. c. the frictional force of the road on the car increases when the car's speed increases. d. the frictional force of the road on the car increases when the car moves to the outside of the curve. e. there is no net frictional force because the road and the car exert equal and opposite forces on each other.
MHD allows the efficiency of conventional power plants to increase
What will be an ideal response?
An RL series circuit has the following components: 5.0-mH coil, 4.8-W resistor, 12-V battery, ammeter, and switch. After the switch is closed for a long time, find the final value of the current
a. 12 A c. 2.5 A b. 2400 A d. 58 A