Charge: What is the charge on 1.0 kg of protons? (e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg)
A. 1.0 C
B. 1000 C
C. 9.6 × 107 C
D. 6.0 × 1026 C
E. 6.0 × 1023 C
Answer: C
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Slanting Surfaces With Friction: A 200-g hockey puck is launched up a ramp that is inclined at a 30° angle above the horizontal. The coefficients of static and kinetic friction between the puck and the ramp are µs = 0.40 and µk = 0.30, respectively, and the puck's initial velocity at the base is 3.8 m/s parallel to the sloping surface of the ramp. What speed does the puck have when it slides back down to its starting point?
Fill in the blank(s) with the appropriate word(s).
A +2.0-nC point charge is placed at one corner of a square (1.5 m on a side), and a ?3.0-nC charge is placed on a corner diagonally away from the first charge. What is the magnitude of the electric field at either of the two unoccupied corners?
A. 20 N/C B. 14 N/C C. 4.0 N/C D. 12 N/C E. 8.0 N/C
An air conditioner with a coefficient of performance of 3.5 uses 30 kW of power. How much power is it discharging to the outdoors?
A) 30 kW B) 75 kW C) 105 kW D) 135 kW E) 210 kW
A uniform magnetic field of 0.50 T is directed along the positive x axis. A proton moving with a speed of 60 km/s enters this field. The helical path followed by the proton shown has a pitch of 5.0 mm. Determine the angle between the magnetic field and the velocity of the proton
a.
39°
b.
51°
c.
44°
d.
34°
e.
71°