A strong spring is stretched 10 cm by a suspended block. If the block's weight is doubled, the spring will stretch to
A) 15 cm.
B) 20 cm.
C) 40 cm.
D) its elastic limit.
Answer: B
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A charged particle moves in a region of uniform magnetic field along a helical path (radius = 4.0 cm, pitch = 20 cm, period = 2.0 ms). What is the speed of the particle as it moves along this path?
A. 0.13 km/s B. 0.10 km/s C. 0.16 km/s D. 0.23 km/s E. 0.06 km/s
An object of mass 4 kg is thrown vertically upwards from ground level with an initial speed of 20 m/s. Ignore friction and use g = 10 m/s2. What is the kinetic energy of the object just before it hits the ground?
A) 800 J B) 400 J C) 0 J D) 100 J E) 200 J
Increased air pressure on the surface of hot water tends to
A) prevent boiling. B) promote boiling. C) neither of these