A 1.0 kg flashlight falls to the floor. At the point during its fall when it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it moving?
A) 3.7 m/s
B) 6.9 m/s
C) 14 m/s
D) 45 m/s
E) 9.8 m/s
A
You might also like to view...
Power: A light bulb operating at a dc voltage of 120 V has a resistance of 200 ?. How much power is dissipated in this bulb?
A. 100 W B. 60 W C. 72 W D. 14 mW E. 7.2 W
Substitute the correct prefix to the fun-word "103-mockingbird"
A) deci B) tera C) peta D) pico E) kilo
The mean life (time constant) of radon-222 is 5.526 d. If a sample of radon initially contains 6.00 × 108 radon atoms, how many of them are left after 10.0 d?
A) 9.82 × 107 B) 7.67 × 107 C) 8.34 × 108 D) 7.29 × 108 E) 8.56 × 108
A stone is thrown with an initial speed of 15 m/s at an angle of 53° above the horizontal from the top of a 40-m building. If g = 9.8 m/s2 and air resistance is negligible, then what is the magnitude of the vertical velocity component of the rock as it hits the ground?
a. 30 m/s c. 26 m/s b. 24 m/s d. 29 m/s