When a spacecraft is launched from the earth toward the sun, at what distance from the earth will the gravitational forces due to the sun and the earth cancel?
Earth's mass is 5.97 × 1024 kg, the sun's mass is 1.99 × 1030 kg, and the Earth-sun distance is 1.5 × 1011 m.
A) 1.3 × 108 m
B) 2.6 × 108 m
C) 1.3 × 1010 m
D) 2.6 × 1010 m
B
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Two automobiles traveling at right angles to each other collide and stick together. Car A has a mass of 1200 kg and had a speed of 25 m/s before the collision
Car B has a mass of 1600 kg. The skid marks show that, immediately after the collision, the wreckage was moving in a direction making an angle of 40° with the original direction of car A. What was the speed of car B before the collision? A) 16 m/s B) 18 m/s C) 11 m/s D) 21 m/s E) 14 m/s
A circuit consists of 2N resistors, all of resistance R, connected as shown below. A potential difference V is applied to one end, and the other end is at ground potential. The equivalent resistance of the circuit is
a.
.
b.
R.
c.
An astronaut is on a 100-m lifeline outside a spaceship, circling the ship with an angular speed of 0.100 rad/s. How far inward can she be pulled before the centripetal acceleration reaches 4g = 39.2 m/s2?
a. 50.0 m b. 70.6 m c. 72.7 m d. 89.9 m
An ohm is equivalent to a(n)
A. volt/meter. B. coulomb/volt. C. ampere/coulomb. D. volt/ampere. E. ampere·coulomb.