A projectile is projected from the origin with a velocity of 45.0 m/s at an angle of 30.0 degrees above the horizontal. What is the velocity when the projectile hits the ground?
A. Vx = 35.7 m/s, Vy = -22.5 m/s
B. Vx = 39.0 m/s, Vy = -22.5 m/s
C. Vx = 35.7 m/s, Vy = -39.0 m/s
D. Vx = 39.0 m/s, Vy = -35.7 m/s
E. Vx = 22.5 m/s, Vy = -22.5 m/s
B. Vx = 39.0 m/s, Vy = -22.5 m/s
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Which of the following statements about x-rays and radio waves is not true?
A) X-rays travel through space faster than radio waves. B) X-rays have shorter wavelengths than radio waves. C) X-rays and radio waves are both forms of light, or electromagnetic radiation. D) X-rays have higher frequency than radio waves.
A 4.0 cm tall object is placed 50 cm away from a converging lens of focal length 25 cm. What is the nature and location of the image?
A) The image is real, 2.5 cm tall, 25 cm on the same side as object. B) The image is virtual, 2.5 cm tall, 25 cm on the other side of the lens. C) The image is virtual, 2.0 cm tall, 15 cm on the other side of the lens. D) The image is virtual, 4.0 cm tall, 50 cm on the same side as object. E) The image is real, 4.0 cm tall, 50 cm on the other side of the lens.
The vector sum of three co-planar forces
a. must be zero. b. must be perpendicular to one of the three. c. must be parallel to one of the three. d. must be perpendicular to the plane. e. may have any direction in the plane.
A hot air balloon along with its cargo has a mass of 4.0 x 105 kg, and it holds 7.0 x 105 m3 of hot air. It is floating at a constant height in air with a density of 1.29 kg/m3. What is the density of the hot air in the balloon?
A) 1.4 kg/m3 B) 0.72 kg/m3 C) 0.57 kg/m3 D) 0.86 kg/m3 E) 0.43 kg/m3