The planetary model of the hydrogen atom consists of an electron in a circular orbit about a proton. The motion of the electron of charge 1.60 × 10^?19 C creates an electric current. The radius of the electron orbit is 5.30 × 10^?11 m and the electron's velocity is 2.20 × 10^6 m/s. What is the magnetic field strength at the location of the proton?
12.5 T
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Which of the following is not a characteristic of continental glaciation?
A) striations B) U-shaped valleys C) drumlins D) moraines
In a room where g = 9.81 m/s2, a hockey puck slides off the edge of a platform with an initial velocity of 28.0 m/s horizontally. The height of the platform above the ground is 2.00 m
What is the speed of the puck just before it hits the ground? The air resistance is negligibly small. A) 28.7 m/s B) 6.26 m/s C) 28.0 m/s D) 48.2 m/s E) 26.3 m/s
If a 20 W laser beam, which has an initial diameter of 2.0 mm, spreads out to a diameter of 2.0 m after traveling 10,000 m, what is the initial intensity of the beam?
a. 
b. 
c. 
d. 
e. 
The orbits of all the planets of the Solar System are inclined _____ to each other
A) less than 2 degrees B) more than 10 degrees C) less than 8 degrees D) more than 12 degrees