You are standing in a moving bus, facing forward, and you suddenly move forward as the bus comes to an immediate stop. What force caused you to move forward?
A)
force of gravity
B)
normal force due to your contact with the floor of the bus
C)
force due to static friction between you and the floor of the bus
D)
force due to kinetic friction between you and the floor of the bus
E)
no forces were responsible for your fall.
E
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A pencil that is 15.7 cm long is released from a vertical position with the eraser end resting on a table. The eraser does not slip as it tips over. Treat the pencil like a uniform rod
What is the angular speed of the pencil just before it hits the table? A) 13.7 rad/s B) 7.23 rad/s C) 3.70 rad/s D) 24.5 rad/s E) 16.8 rad/s
The Hertzsprung-Russell diagram can be labeled many different ways. Which coordinates CANNOT be used on an H-R diagram?
a. luminosity versus spectral type b. luminosity versus temperature c. radius versus temperature d. absolute magnitude versus temperature e. luminosity versus color
Energy Conservation With Conservative Forces: A frictionless simple pendulum, with a small but dense 4.4-kg mass at the end and a length of 75 cm, is released from rest at an angle of 50° with the vertical.(a) To what height above its lowest point does the mass swing on the other side?(b) What is the speed of the mass at the bottom of the swing?
What will be an ideal response?
A person can see well in the distance, but cannot do so at an arm's-length distance. To correct this, lenses that are ________ having a ________ power could be used
a. thicker at their center than at the edges, positive b. thicker at their center than at the edges, negative c. thinner at their center than at the edges, positive d. thinner at their center than at the edges, negative