A ball is thrown straight up with a speed of 30 m/s, and air resistance is negligible
(a) How long does it take the ball to reach the maximum height?
(b) What is the maximum height reached by the ball?
(c) What is its speed after 4.2 s?
What will be an ideal response?
(a) 3.1 s (b) 46 m (c) 11 m/s
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Calculate the number of atoms per unit volume in BCC solid sodium (Na) assuming that the lattice parameter for sodium is 0.428 nm.
What will be an ideal response?
If you plug a 110-V electric toaster into a 220-V outlet, current in the toaster will be about
A) half what is should be. B) the same as if it were plugged into a 110-V outlet. C) more than twice what it should be. D) twice what it should be.
A cube-shaped box is sitting on the floor. The pressure the box exerts on the floor is 235 Pa. If the density of the box is 21.0 kg/m3, what is the length of each side of the box?
a. 0.00910 m b. 1.14 m c. 110 m d. 11.2 m
A neutral atom always contains
a. the same number of protons as it does neutrons. b. the same number of electrons as it does neutrons. c. the same number of protons as it does electrons. d. twice as many protons as it does neutrons. e. twice as many neutrons as it does protons.