A 75.0-kg swimmer dives horizontally off a 465-kg raft initially at rest. If the diver's speed immediately after leaving the raft is 5.00 m/s, what is the corresponding raft speed?
a. 31.0 m/s
b. 375 m/s
c. 0.806 m/s
d. 1.24 m/s
e. 5.00 m/s
c
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Potential: A tiny particle with charge + 5.0 ?C is initially moving at 55 m/s. It is then accelerated through a potential difference of 500 V. How much kinetic energy does this particle gain during the period of acceleration?
A. 1.0 × 104 J B. 2.5 × 10-3 J C. 100 J D. 2500 J
If we learn that F = G mM/d2 where the units are F:Newtons, m:kg, M:kg, and d:meters; what are the units of G?
What will be an ideal response?
The intensity level of a power mower at a distance of 1.0 m is 100 dB. You wake up one morning to find that four of your neighbors are mowing their lawn 20 m from your open bedroom window. What is the intensity level in your bedroom?
A) 80 dB B) 104 dB C) 400 dB D) 50 dB E) 40 dB
The angular resolution of the eye is about 5 × 10-4 rad. The Moon is about 400,000 km from the earth and has a diameter of about 3500 km. What is the smallest feature on the Moon that can be resolved with the unaided eye?
A) 400 km B) 1000 km C) 100 km D) 1.8 km E) 200 km