The ionosphere is a layer of ionized gas that is
A) above the exosphere.
B) between the thermosphere and the exosphere.
C) within the thermosphere.
D) within the stratosphere.
E) within the troposphere.
C
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In Einstein's famous equation E = m ? c2, describing the relationship between matter and energy, the units for E are (given that m ? kg, c ? m/s, N = kg ? m/ s2 )
A) m/N B) kg m/ s2 C) m2/ s2 D) N/m E) N? m
The Big Bang predicts that the universe should be 25 percent hydrogen and 75 percent helium
Indicate whether the statement is true or false
You are standing in a moving bus, facing forward, when you suddenly slide forward as the bus comes to an immediate stop. What force caused you to slide forward?
A) gravity B) the normal force due to your contact with the floor of the bus C) the force due to friction between you and the floor of the bus D) There is not a force causing you to slide forward.
A 55kg girl swings on a swing, whose seat is attached to the pivot by 2.5m long rigid rods (considered to be massless in this problem). As she swings, she rises to a maximum height such that the angle of the rods with respect to the vertical is 32 degrees. What is the average torque on the rods due to her weight, as she moves during one cycle of her swinging from the bottom of her swing path to the highest point?
A. 370 Nm B. 970 Nm C. 2400 Nm D. 2000 Nm