Since the big bang, but before now, a time existed where matter was not dominant
a. True
b. False
Indicate whether the statement is true or false
True
RATIONALE:
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A 1500-W heater is connected to a 120-V line. How much heat energy does it produce in 2.0 hours?
A) 1.5 kJ B) 3.0 kJ C) 0.18 MJ D) 11 MJ E) 18 MJ
A point charge Q = 7.00 × 10-9 C is placed at the origin of an xy-coordinate system. What is the electric field intensity E at a distance of x = 30 cm from this charge? (Use k = 9 × 109 Nm2/C2.)
A) 100 N/C B) 400 N/C C) 500 N/C D) 600 N/C E) 700 N/C
The scalar product is commutative
Indicate whether the statement is true or false
A 1.6-kg block is attached to the end of a 2.0-m string to form a pendulum. The pendulum is released from rest when the string is horizontal. At the lowest point of its swing when it is moving horizontally, the block is hit by a 10-g bullet moving horizontally in the opposite direction. The bullet remains in the block and causes the block to come to rest at the low point of its swing. What was
the magnitude of the bullet's velocity just before hitting the block? a. 1.0 km/s b. 1.6 km/s c. 1.2 km/s d. 1.4 km/s e. 1.8 km/s