A 12-g bullet moving horizontally strikes and remains in a 3.0-kg block initially at rest on the edge of a table. The block, which is initially 80 cm above the floor, strikes the floor a horizontal distance of 120 cm from its initial position. What was the initial speed of the bullet?
a. 0.68 km/s
b. 0.75 km/s
c. 0.81 km/s
d. 0.87 km/s
e. 0.41 km/s
b
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A 6.5-g iron meteor hits Earth at a speed of 295 m/s. If its kinetic energy is entirely converted to the thermal energy of the meteor, by how much will its temperature rise? The specific heat of iron is 113 cal/kg ? C°, and 1 cal = 4.186 J
A) 92.0 C° B) 57,100 C° C) 0.147 C° D) 384 C°
One of the intriguing questions for scientists of many ages has been "What are the elementary particles?" Which of the following is not considered an elementary particle?
A. Electron B. Quark C. Proton D. Muon
The purity of an alloy is given by the _____________.
Fill in the blank(s) with the appropriate word(s).
The greenhouse effect is occurring because
a. the ozone layer is being depleted b. the amount of carbon dioxide in the atmosphere is increasing c. the ionosphere reflects low frequency radiation d. more ultraviolet radiation is penetrating the atmosphere e. none of the above