A propeller is spun up from rest to 1500 rpm under the influence of a constant torque in 15.0s. If the work done by the engine in giving the propeller its final angular velocity is 25kJ, what is the torque supplied by the engine?
A. 21Nm
B. 11 Nm
C. 42 Nm
D. 21 Nm
E. 130 Nm
A. 21Nm
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If the average translational kinetic energy of the molecules in one sample of gas has twice the value of that of another sample of gas and the temperature of the first sample of gas is 100°C, what is the temperature of the second sample of gas?
1.100°C 2.50°C 3.0°C 4.-86.6°C
You stand near the earth's equator. A positively charged particle that starts moving parallel to the surface of the earth in a straight line directed east is initially deflected upwards. If you know there are no electric fields in the vicinity, a possible reason why the particle does not initially acquire a downward component of velocity is because near the equator the magnetic field lines of the earth are directed
A. upward. B. downward. C. from south to north. D. from north to south. E. from east to west.
This photo shows apparatus used in an experiment in which materials thought to have been present on the early Earth were sparked with energy. What have we learned from this type of experiment?
A) These experiments have shown that the building blocks of life form easily and naturally under conditions that existed on the early Earth. B) These experiments have told us the precise composition of Earth's early atmosphere. C) These experiments have shown us how life originated on Earth. D) These experiments have provided strong evidence for the idea that life first arose near volcanic vents at the bottom of the ocean.
Which of these is stated properly?
a. "The temperature of liquid nitrogen is 77 Kelvin.". b. "The temperature of liquid nitrogen is 77 Kelvins.". c. "The temperature of liquid nitrogen is 77 degrees Kelvin.". d. "The temperature of liquid nitrogen is 77 Kelvin degrees.".