Sputnik I was launched into orbit around Earth in 1957. It had a perigee (the closest approach to Earth, measured from Earth's center) of 6.81 × 106 m and an apogee (the furthest point from Earth's center) of 7.53 × 106 m
What was its speed when it was at its perigee? The mass of Earth is 5.97 × 1024 kg and G = 6.67 x 10-11 N•m2/kg2. A)
7.18 × 103 m/s
B)
7.84 × 103 m/s
C)
8.23 × 103 m/s
D)
11.0 × 103 m/s
E)
13.4 × 103 m/s
B
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Three 2.50-?C charges are placed on tiny conducting spheres at the ends of 1.00 m-long strings that are connected at 120° angles as shown below. The magnitude, in N, of the force on any one of the charges is
?
?
A. 1.88 × 10?2. B. 3.25 × 10?2. C. 3.73 × 10?2. D. 6.50 × 10?2. E. 7.50 × 10?2.
A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together. In what direction does the wreckage move just after the collision?
A) 36.9° N of E B) 42.0° N of E C) 45.0° N of E D) 53.1° N of E E) 48.0° N of E
Explain why cars are responsible for so much of the carbon monoxide emitted every year (see Table 15.5)
What will be an ideal response?
A billiard ball (Ball #1) moving at 5.00 m/s strikes a stationary ball (Ball #2) of the same mass. After the elastic collision, Ball #1 moves at a speed of 3.50 m/s. Find the speed of Ball #2 after the collision
a. 1.25 m/s c. 2.16 m/s b. 1.50 m/s d. 3.57 m/s