An electric heater is rated 300W 110V. The safety fuse in the circuit can withstand 15 A of current. How many heaters can be safely operated in the circuit?
A) 2
B) 3
C) 4
D) 5
E) more than 5
Answer: D
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A conducting bar of length L rotates with a constant angular speed of +2.0 rad/s about a pivot P at one end, as shown. A uniform magnetic field (magnitude = 0.20 T) is directed into the paper. If L = 0.40 m, what is the potential difference, VA ? VP?
a.
?12 mV
b.
+8.0 mV
c.
?8.0 mV
d.
+12 mV
e.
?16 mV
An object starts from rest at time t = 0.00 s and moves with constant acceleration. The object travels 3.00 m from time t = 1.00 s to time t = 2.00 s. What is the acceleration of the object?
A) -3.00 m/s2 B) 6.00 m/s2 C) -1.00 m/s2 D) 1.00 m/s2 E) 2.00 m/s2
A neutron with a mass of 1.67 × 10-27 kg traveling east with a kinetic energy of 2.00 × 10-21 J collides perfectly elastically with a helium nucleus with a mass 6.68 × 10-27 kg that is initially at rest
After the collision, the neutron has a kinetic energy 1.80 × 10-21 J. What angle was the neutron deflected during the collision? A) 142° B) 117° C) 38.0° D) 180° E) 32.8°
Classical Greek astronomers believed the motions of the heavens could be described by uniform circular motion
a. True b. False Indicate whether the statement is true or false