A pickup truck moves 25. m/s Eastward. Jerry is standing in the back and throws a baseball in what to him is the Southwest direction at 28. m/s (with respect to the truck). A person at rest would see the ball moving HOW FAST in WHAT DIRECTION?
What will be an ideal response?
20. m/s at 15.° E of S
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One star has a temperature of 10,000 K and another star has a temperature of 5,000 K. Compared to the cooler star, how much more energy per second will the hotter star radiate from each square meter of its surface?
a. 16 times b. 2 times c. 1 × 10^16 times d. 625 times e. 25 times
The position of a mass that is oscillating on a spring is given by x = (12.3 cm) cos[(1.26 s2)t]. What is the acceleration of the mass when t = 0.825 s?
A) 9.89 cm/s2 B) -9.89 cm/s2 C) 10.6 cm/s2 D) -10.6 cm/s2 E) 0 cm/s2
A battery operating a large flashlight produces a current of 2 amperes in a light bulb that has a resistance of 4 ohms. The voltage of the battery is 2 volts
Indicate whether the statement is true or false
Suppose a star has twice the surface temperature of the sun and also twice the radius. How many times larger is the rate at which this star emits energy compared to the rate at which the sun emits energy?
A. It radiates at the same rate as the sun. B. 2 times C. 4 times D. 8 times E. 16 times F. 32 times T. 64 times