A tractor T is pulling a trailer M with a constant acceleration. If the forward acceleration is 0.50 
and M = 400 kg and T = 500 kg, then the horizontal force on the tractor due to the ground is
A. 450 N forward.
B. 450 N backward.
C. 250 N forward.
D. 250 N backward.
E. 200 N forward.
A. 450 N forward.
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Can the temperature of an ideal gas and the internal energy of an ideal gas increase with no energy transfer by heat?
1.No, if there is no energy transfer by heat to an ideal gas, then the internal energy of the gas must stay constant and so must its temperature. 2.No, although the internal energy of the ideal gas may increase with no energy transfer by heat, the temperature of the gas will not change. 3.Yes, the temperature of an ideal gas and the internal energy of an ideal gas can increase with no energy transfer by heat. 4.No, although the temperature of the ideal gas may increase with no energy transfer by heat, the internal energy will not change.
The figure represents the position of a particle as it travels along the x-axis. Between t = 2 s and t = 4 s, what is (a) the average speed of the particle and (b) the average velocity of the particle?
What will be an ideal response?
A 3.00-kg block of silicon at 60.0°C is immersed in 6.00 kg of mercury at 20.0°C. What is the entropy increase of this system as it moves to equilibrium?
The specific heat of silicon is 0.17 cal/(g?K) and the specific heat of mercury is 0.033 cal/(g?K). A) 8.8 × 10-1 J/K B) 4.8 J/K C) 6.9 J/K D) 5.2 × 10-2 J/K E) -0.46 J/K
A spinning neutron star has been observed at the center of a ________
A) red supergiant B) supernova remnant C) planetary nebula D) protostar