A navigational beacon in deep space broadcasts at a radio frequency of 50 MHz. A spaceship approaches the beacon with a relative velocity of 0.40c. The spaceship passes the beacon and departs from it with a DIFFERENT relative velocity
The beacon signal is now detected at a frequency of 40 MHz. What is the new velocity of the spaceship relative to the beacon?
A) 0.24c B) 0.28c C) 0.26c D) 0.20c E) 0.22c
E
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The solar energy coming to the earth by radiation is 1,340 W/m2 . If the sun has a radius of 7.000 x 108m, is a perfect radiator and is located 1.500 ? 1011m from the earth, then what is the temperature of the sun?
A. 6430 K B. 5760 K C. 4230 K D. 3670 K E. 3210 K
Torque: A flat circular wire loop of area 0.25 m2 carries a current of 5.0 A. This coil lies on a horizontal table with the current flowing in the counterclockwise direction when viewed from above. At this point, the earth's magnetic field is 1.2 × 10-5 T directed 60° below the horizontal. What is the magnitude of the torque that the earth's magnetic field exerts on this loop?
A. 2.5 × 10-6 N ? m B. 5.0 × 10-6 N ? m C. 7.5 × 10-6 N ? m D. 1.0 × 10-5 N ? m
A ball rolls off a shelf and hits the floor below 0.25 second later. To find the speed of the ball as it left the shelf, we would need
A. to repeat the experiment. B. the distance measured along the floor to the point of impact. C. the weight of the ball. D. the height of the table.
An electric motor can be manually turned and made to act as a generator
Indicate whether the statement is true or false