A satellite is placed in a geosynchronous orbit. In this equatorial orbit with a period of 24 hours, the satellite hovers over one point on the equator. Which statement is true for a satellite in such an orbit?
a. There is no gravitational force on the satellite. b. There is no acceleration toward the center of the Earth.
c. The satellite is in a state of free fall toward the Earth.
d. There is a tangential force that helps the satellite keep up with the rotation of the Earth.
e. The force toward the center of the Earth is balanced by a force away from the center of the Earth.
C
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Projectile Motion: A football kicker is attempting a field goal from 44 m out. The ball is kicked and just clears the lower bar with a time of flight of 2.9 s. If the angle of the kick was 45°, what was the initial speed of the ball, assuming no air resistance?
A. 21.5 m/s B. 19.7 m/s C. 2.2 m/s D. 39 m/s
Conduction: Two metal rods, one silver and the other gold, are attached to each other end-to-end. The free end of the silver rod is immersed in a steam chamber at 100°C, and the free end of the gold rod in an ice water bath at 0°C. The rods are both 5.0 cm long and have a square cross-section that is 2.0 cm on a side. No heat is exchanged between the rods and their surroundings, except at the ends. What is the temperature at the point where the two rods are in contact with one another? The thermal conductivity of silver is 417 W/m ? K, and that of gold is 291 W/m ? K.
A. 39°C B. 41°C C. 47°C D. 53°C E. 59°C
In order for a force to do no work on an object
A. All forces must do work. B. The object is stationary, or the force is perpendicular to the motion C. The force is perpendicular to the direction of motion D. The object is stationary
A gas expands as shown in the graph. If the heat taken in during this process is 1.02 × 106 J and 1 atm = 1.01 × 105 N/m2, the change in internal energy of the gas (in J) is how much?
?
?
A. ?2.42 × 106 B. ?1.40 × 106 C. ?1.02 × 106 D. 1.02 × 106 E. 1.40 × 106