A high-diver of mass 70.0 kg jumps off a board 10.0 m above the water. If, two seconds after entering the water, his downward motion is stopped, what average upward force did the water exert on him?
What will be an ideal response?
1 180 N
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If a 1 050-kg car was moving at 25 m/s, what would be its kinetic energy expressed in the unusual (for kinetic energy) units of calories? (1 cal = 4.186 J)
a. 3.1E+5 b. 3.3E+5 c. 6.6E+5 d. 7.8E+4 e. 6.3E+3
Electrons are used to produce X-rays by allowing a beam of electrons to strike a heavy metal surface. When the intensity of the electron beam is increased, this results in:
A. X-rays being produced having longer wavelength B. X-rays being produced having higher energy C. More X-rays produced per unit time D. Faster X-rays being produced
Which of the following tests would probably not be successful for a brittle ceramic material?
(a) Three-point bend test (b) Tensile test with a standard tensile-test specimen, as shown in Figure 6.15a (c) Tensile test with a dog-bone specimen, as shown in Figure 6.26 (d) Compression test with a cylinder of ceramic
At what rate is the human body radiating energy when it is at 33°C? Take the body surface area to be 1.4 m2, and approximate the body as a black body
What will be an ideal response?