The four fundamental forces are
A) strong force, weak force, electromagnetic force, and gravity.
B) strong force, weak force, electric force, and magnetic force.
C) nuclear force, electromagnetic force, gravity, and tidal force.
D) nuclear force, gravity, electric force, and magnetic force.
A) strong force, weak force, electromagnetic force, and gravity.
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A 15-kg mass, attached to a massless spring whose force constant is 2500 N/m, has an amplitude of 4 cm. Assuming the energy is quantized, find the quantum number of the system, n, if En = nhf
a. 1.5 × 10^33 b. 3.0 × 10^33 c. 4.5 × 10^33 d. 5.4 × 10^33 e. 1.0 × 10^33
Determine the temperature at the four nodes shown in the sketch. Assume steady conditions and two-dimensional heat conduction. The four faces of the square shape are each at different temperatures as shown.
GIVEN
Square shape with four different face temperatures
FIND
Temperature at four interior nodes
SKETCH
A 0.20-m-long metal rod has a radius of 3.0 cm and a resistance of 2.5 × 10^?5 ?. What is the resistivity of the metal?
a. 1.1E–8 ??m b. 3.5E–7 ??m c. 1.0E–8 ??m d. 1.8E–8 ??m e. 1.2E–7 ??m
The electric field between two charged plates is 7.2 kN/C. If the plates are separated by 3.0 mm, what is the potential difference between them?
A. Need more information B. 240 kV C. 220 V D. 22 V