Specific Heat: A person consumes a snack containing 14 food calories (14 kcal). What is the power this food produces if it is to be "burned off" due to exercise in 6 hours? (1 cal = 4.186 J)
A. 2.7 W
B. 9763 W
C. 0.6 W
D. 0.0027 W
Answer: A
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Velocity Selector: In a velocity selector consisting of perpendicular electric and magnetic fields, the speeds of the charged particles passing through the selector are increased or decreased until they are equal to the desired speed.
A. True B. False
Which of the following substances is a mineral?
quartz petroleum pearl granite amber
Suppose an object is placed 6.0 cm in front of a lens that has a focal length of 4.0 cm. Where is the image located? What are the magnification and the character of the image?
What will be an ideal response?
A 90-kg halfback running north with a speed of 10 m/s is tackled by a 120-kg opponent running south at 5.0 m/s. The collision is perfectly inelastic. Compute the velocity of the two players just after the tackle
a. 1.4 m/s south c. 2.8 m/s north b. 2.8 m/s south d. 1.4 m/s north