Can an object's velocity change direction when its acceleration is constant? Support your answer with an example
A)
No, this is not possible because it is always speeding up.
B)
No, this is not possible because it is always slowing up.
C)
No, this is not possible because it is always speeding up or always slowing down, but it can never turn around.
D)
Yes, this is possible, and a rock thrown straight up is an example.
E)
Yes, this is possible, and a car that starts from rest, speeds up, slows to a stop, and then backs up is an example.
D
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A rock held above the ground has potential energy. As the rock falls, this potential energy is converted to kinetic energy. Finally, the rock hits the ground and stays there. What has happened to the energy?
A) It is transformed back into gravitational potential energy. B) The energy goes into the ground, and as a result, the orbit of the Earth about the Sun is slightly changed. C) The energy goes to producing sound and to heating the ground, rock, and surrounding air. D) The rock keeps the energy inside it in the form of mass-energy.
If the total translational kinetic energy of the molecules of oxygen in a container is 15 J at room temperature, what is the total rotational kinetic energy of these molecules?
a. 5 J b. 10 J c. 20 J d. 25 J e. 0 J
Around other suns, we have found Jupiters where Mercury is in our solar system
Indicate whether the statement is true or false
The torque required to turn the crank on an ice cream maker is 4.50 Nm. How much work does it take to turn the crank through 300 full turns?
A) 4240 J B) 8480 J C) 2120 J D) 1350 J E) 2700 J