A 2.0 kg mass is attached to the end of a horizontal spring (k = 50. N/m) and set into simple harmonic motion with an amplitude of 10. cm. What is the total mechanical energy of this system?
A) 0.02 J
B) 25 J
C) 0.25 J
D) 1.00 J
E) 2.5 J
C
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A slice of bread contains about 125 kcal. If specific heat of a person were 1.00 kcal/kg/°C, by how many °C would the temperature of a 65.0-kg person increase if all the energy in the bread were converted to heat?
a. 3.85°C b. 0.96°C c. 1.92°C d. 2.40°C e. 1.44°C
A bridge is made with segments of concrete 50 m long. If the linear expansion coefficient is 12 × 10^-6 (°C)-1, how much spacing (in cm) is needed to allow for expansion during an extreme temperature change of 150° F?
a. 10 b. 2.5 c. 7.5 d. 5.0 e. 9.5
As the temperature of the air increases, what happens to the velocity of sound? (Assume that all other factors remain constant.)
A) It increases. B) It decreases. C) It does not change. D) It increases when atmospheric pressure is high and decreases when the pressure is low.
Imagine that in a Davisson–Germer-type experiment we shine a beam of electrons on a nickel crystal perpendicular to the crystal face and find that we get enhanced scattering at an angle of 50°. If we double the electrons’ kinetic energy,
(a) the angle of enhanced scattering will (A) increase, (B) decrease, or (C) remain constant, (b) by a factor (A) a bit larger than, (B) a bit less than, or (C) equal to (c) (A) 1 (B) 21/2, or (C) 2