How long will it take a charged 80-?F capacitor to lose 20% of its initial energy when it is allowed to discharge through a 45-? resistor?
a. 0.92 ms
b. 0.64 ms
c. 0.40 ms
d. 0.19 ms
e. 0.80 ms
c
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What do we call a specific pattern of stars in the sky, often named for an animal?
A. a star animal B. a cluster C. the ecliptic D. a constellation
The planet Venus requires 225 days to orbit the sun, which has a mass M = 1.99 × 10^30 kg, in an almost circular trajectory. Calculate the radius of the orbit and the orbital speed of Venus as it circles the sun
The coefficient of volume expansion of a certain olive oil is 0.68 × 10-3 K-1. A 1.0-L glass beaker is filled to the brim with olive oil at room temperature
The beaker is placed on a range and the temperature of the oil and beaker increases by 25 C°. As a result, 0.0167 L of olive oil spills over the top of the beaker. Which of the following values is closest to the coefficient of linear expansion of the glass from which the beaker is made? A) 1 × 10-6 K-1 B) 4 × 10-6 K-1 C) 1 × 10-5 K-1 D) 2 × 10-5 K-1 E) 3 × 10-5 K-1
You and Al are both floating freely in your spaceships. Suppose Al is moving away from you at 85 km/hr. You throw a ball in his direction at a speed of 75 km/hr. According to Al, which of the following is going on?
A) He agrees that he is moving at 85 km/hr and the ball is moving at 75 km/hr while you are standing still. B) He sees you moving away from him at 85 km/hr and the ball moving toward him at 75 km/hr. C) He sees you moving away from him at 85 km/hr and the ball moving toward him at 10 km/hr. D) He sees you moving away from him at 85 km/hr and the ball moving away from him at 10 km/hr. E) He sees you moving toward him at 85 km/hr and the ball moving toward him at 75 km/hr.