The standard unit of time is the
a. hour.
b. day.
c. second.
d. minute.
c
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Which one of the following is the correct expression for the Heisenberg uncertainty principle?
A) ?py ?y ? h/2? B) ? py ?y ? h/2? C) ? py /?y ? h/2? D) ?y/? py ? h/2? E) None of the other answers is correct.
What is the maximum radiation pressure exerted by sunlight in space (S = 1350 W/m2) on a highly polished silver surface?
a. 1.4 × 10^?2 Pa b. 0.12 Pa c. 9.0 × 10^?6 Pa d. 4.5 × 10^?5 Pa e. 2.3 × 10^?6 Pa
Two wheels have the same total mass M and radius R. One wheel is a uniform disk. The other is like a bicycle wheel, with lightweight spokes connecting the rim to a small hub. Which likely has the larger moment of inertia?
A. The solid disk. B. The wheel with spokes. C. The moment of inertia will be nearly the same for both. D. We need more information to answer.
A ball is thrown at an original speed of 8.0 m/s at an angle of 35° above the horizontal. If there is no air resistance, what is the speed of the ball when it returns to the same horizontal level?
A) 4.0 m/s B) 8.0 m/s C) 16 m/s D) 9.8 m/s