A one kilogram grapefruit weighs ten newtons. Suppose we take this grapefruit to the moon. The force of gravity on the grapefruit will then be
A) less than one kilogram.
B) less than ten newtons.
C) ten newtons.
D) one kilogram.
E) None of the above.
B
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Thin Lenses: A slide projector is set up with its lens 6.0 m from the screen. The projected image on the screen is 1.5 m square for a slide (the object) that is 2.5 cm square.(a) How far is the slide from the lens?(b) What is the focal length of the projector lens?
Fill in the blank(s) with the appropriate word(s).
Two identical grasshoppers jump with the same initial speed. Grasshopper A goes straight up, but grasshopper B goes up at a 66° angle above the horizontal. Assume no air resistance and choose your system to be grasshopper-Earth
Which of the following statements about these grasshoppers are correct? (There could be more than one correct choice.) A) At their highest point, both systems have the same amount of gravitational potential energy. B) At their highest point, both systemshave the same amount of kinetic energy. C) At their highest point, both systemshave the same amount of mechanical energy. D) At their highest point, grasshopper B is moving faster than grasshopper A. E) At their highest point, the system grasshopper A-Earth has more gravitational potential energy than the system grasshopper B-Earth.
In the double-exhaust model, the radio lobes of a radio galaxy are inflated by
a. jets of excited gas flowing from the central galaxy. b. jets of high-energy sound waves flowing from the central galaxy. c. a disk of ionized material that orbits very near a supermassive black hole. d. dark clouds of very cold gas and dust. e. None of the other choices are correct.
At position A within a tube containing fluid that is moving with steady laminar flow, the speed of the fluid is 12.0 m/s and the tube has a diameter 12.00 cm
At position B, the speed of the fluid is 18.0 m/s and the tube has a diameter 6.00 cm. What is the ratio of the density of the fluid at position A to the density of the fluid at position B? A) 3.00 B) 0.167 C) 0.375 D) 0.333 E) 0.750