It is a well-known fact that water has a higher specific heat capacity than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium
The same amount of heat, 30 calories, is added to each. Which statement is true?
A)
They remain in thermal equilibrium.
B)
They are no longer in thermal equilibrium; the iron is warmer.
C)
They are no longer in thermal equilibrium; the water is warmer.
D)
It is impossible to say without knowing the exact mass involved.
E)
It is impossible to say without knowing the exact specific heat capacities.
B
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Without greenhouse gases in our atmosphere, the Earth's oceans would not be liquid
Indicate whether the statement is true or false
If the magnetic field of an electromagnetic wave is in the +x-direction and the electric field of the wave is in the +y-direction, the wave is traveling in the
A) xy-plane. B) +z-direction. C) -z-direction. D) -x-direction. E) -y-direction.
A policeman walks on his beat back and forth. His average speed is determined from
A. time divided by how far he ends up from the starting point. B. his velocity divided by the time. C. time divided by his total distance covered. D. his total distance covered divided by the time.
A 3.00-m-long 200-N ladder, leans against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.00 m away from the wall. The ladder is not completely uniform, so its center of gravity is 1.20 m from its base
What force of friction must the floor exert on the base of the ladder to prevent the ladder from sliding down? A) 93.3 N B) 130 N C) 28.3 N D) 102 N E) 150 N