A 1 newton apple hangs from a tree branch. The force by the apple on Earth
A) cannot be determined from the given information, because the mass of the earth needs to be given.
B) is 1 newton downward.
C) is 1 newton upward.
D) is zero.
E) is much smaller than 1 newton, but not zero.
C
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This graph is made from measurements of the cosmic microwave background (dots) and a model based on the hypothesis of inflation. What does it show?
A) Measurements of the separation between regions of different temperature (in the cosmic microwave background) agree with predictions made by the hypothesis of inflation. B) It shows that the temperature of the cosmic microwave background is about 3 Kelvin. C) It shows that some regions of the early universe must have been hundreds of times as dense as others. D) It shows that the universe has no center and no edges.
A stick is moving along the x-axis at 90%c. A person riding with the stick sees it inclined at 45.° with respect to the x-axis. Observers in the rest frame see the stick making what angle with respect to the x-axis?
A) 79.° B) 66.° C) 53.° D) 45.° E) 88.°
As shown in the diagram, you've just shined a flash light toward Al, so from your point of view the light is moving to the right at speed c. Al is moving away from you to the right at speed 0.9c. According to Al, what is the light doing?
A) moving to the right at speed c B) gradually catching up to him at speed 0.1c C) moving to the right at speed 1.9c D) moving to the left at 0.1c
What is the mass defect of an alpha particle?
a. 
b. 
c. 
d. 