A 100 kg mass is blown apart into a 60 kg piece and a 40 kg piece. After the blast, the two masses are moving apart with a relative velocity of 60 m/s. The velocity of the 60 kg mass is
A. 88 m/s.
B. 67 m/s.
C. 51 m/s.
D. 40 m/s.
E. 24 m/s.
E. 24 m/s.
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The main reason for positioning many radio telescopes across a large area and combining the signals is
a. to observe more objects in a shorter amount of time. b. provide a backup system if one or more of the telescopes go down. c. to produce higher resolution images. d. to avoid interference between signals from the separate telescopes. e. to account for the motion of objects in the sky as a result of the Earth's rotation.
Four resistors having resistances of 20 ?, 40 ?, 60 ?, and 80 ? are connected in series across an ideal 50-V dc source
What is the current through each resistor? A) 0.25 A B) 4.0 A C) 0.75 A D) 2.0 A E) 0.50 A
The speed of a boat is often given in knots. If a speed of 5 knots were expressed in the SI system of units, the units would be:
a. m c. m/s b. s d. kg/s
The specific heat capacity of water is about twice the specific heat capacity of ice. The amount of heat required to raise the temperature of 1 kg of water 10°C is __________ times the amount of heat required to raise the temperature of 1 kg of ice 10°C
Fill in the blank(s) with correct word