A bridge that was 8.3 m long has been washed out by the rain several days ago. How fast must a car be going to successfully jump the stream? Although the road is level on both sides of the bridge, the road on the far side is 2.0 m lower than the road on this side
a. 5.0 m/s
c. 13 m/s
b. 7.8 m/s
d. 25 m/s
C
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A 3.00 kg pendulum bob on a string 2.00 m long is released with a velocity of 2.00 m/s when the support string makes an angle of 45.0 degrees with the vertical. What is the tension in the string at the highest point of its motion?
A. 12.5 N B. 17.8 N C. 21.4 N D. 28.9 N E. 31.6 N
A 14-A current flows into a series combination of a 3.0-? and a 4.0-? resistor. What is the voltage drop across the 4.0-? resistor?
A) 24 V B) 38 V C) 42 V D) 56 V E) 98 V
In a reflecting telescope the objective is a ____
a. prism b. mirror c. lens d. diffraction grating e. photographic plate
A 10-g bullet moving horizontally with a speed of 2.0 km/s strikes and passes through a 4.0-kg block moving with a speed of 4.2 m/s in the opposite direction on a horizontal frictionless surface. If the block is brought to rest by the collision, what is the kinetic energy of the bullet as it emerges from the block?
a. 0.51 kJ b. 0.29 kJ c. 0.80 kJ d. 0.13 kJ e. 20 kJ