A football kicker is attempting a field goal from out. The ball is kicked and just clears the lower bar with a time of flight of 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
A
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As water is withdrawn from a well, the water table around the well
A) subsides. B) drops, making a cone of depression around the well. C) dries up. D) rises.
Current evidence suggests that some massive jovian planets orbit at close orbital distances to their stars. How do we think these planets ended up on these close orbits?
A) These planets migrated inward after being born on orbits much farther from their stars. B) These planets were able to form close to their stars because their solar nebulas were cold in temperature. C) Despite their large masses, these planets are made of rock and metal and therefore could form in their inner solar systems. D) These planets were captured from other solar systems.
If Fig. 39.2 represents a planet with the same period as Earth, how long does it take for the planet to move from one dot to the next?
A proton and an alpha particle are moving perpendicular to a uniform magnetic field with the same speed. If the velocity of the proton is at an angle of 20° with respect to the magnetic field direction, at what angle to the magnetic field direction would the alpha particle be moving if it experiences the same magnitude acceleration as the proton? The alpha particle has 4 times the mass of the
proton and twice its charge. a. 43° c. 62° b. 10° d. 9.8°