A person who weighs 550 N empties her lungs as much as possible and is then completely immersed in water while suspended from a harness. Her apparent weight is now 21.2 N. What is her density?
A) 1050 kg/m3
B) 1040 kg/m3
C) 1030 kg/m3
D) 960 kg/m3
E) 56.1 kg/m3
B
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An 8.0-kg object moving 4.0 m/s in the positive x direction has a one-dimensional collision with a 2.0-kg object moving 3.0 m/s in the opposite direction. The final velocity of the 8.0-kg object is 2.0 m/s in the positive x direction. What is the total kinetic energy of the two-mass system after the collision?
A. 32 J B. 52 J C. 41 J D. 25 J E. 29 J
A football is thrown upward at a 30.0° angle to the horizontal. To throw a 40.0-m pass, what must be the initial speed of the ball?
What will be an ideal response?
Which type of electromagnetic wave has the largest wavelength?
a. gamma rays b. radio waves c. x-rays d. visible light
During the period each year when we see Mars undergoing apparent retrograde motion in our sky, what is really going on in space?
A) Earth and Mars are getting closer together. B) Mars is moving around the Sun in the opposite direction from which Earth is moving around the Sun. C) Earth is catching up with and passing by Mars in their respective orbits. D) Earth and Mars are on opposite sides of the Sun.