Which of the following is not a feature of the Sun's
surface?
a) sunspots.
b) prominences.
c) flares.
d) rills.
[Ques. 2] As a particle moves along the x axis it is acted upon by a single conservative force given by Fx = (20 4.0x) N where x is in m. The potential energy associated with this force has the value +30 J at the origin (x = 0). What is the value of the potential energy at x = 4.0 m?
a. 48 J
b. +78 J
c. 18 J
d. +48 J
e. +80 J
[Ques. 3] The visible surface of the Sun is called the
a)chromosphere.
b)photosphere.
c)corona.
d)celestial sphere.
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[Ques. 4] A single conservative force Fx = (6.0x 12) N (x is in m) acts on a particle moving along the x axis. The potential energy associated with this force is assigned a value of +20 J at x = 0 . What is the potential energy at x = 3.0 m?
a. +11 J
b. +29 J
c. +9.0 J
d. 9.0 J
e. +20 J
[Ques. 5] The Sun is a spherically shaped star that is
composed primarily of
a)iron.
b)hydrogen.
c)water.
d)helium.
[Ques. 6] A U-238 nucleus (mass = 238 units) decays, transforming into an alpha particle (mass = 4.00 units) and a residual thorium nucleus (mass = 234 units). If the uranium nucleus was at rest, and the alpha particle has a speed of 1.50 107 m/s, determine the recoil speed of the thorium nucleus.
[Ques. 7] A pitcher claims he can throw a baseball with as much momentum as a 3.00-g bullet moving with a speed of 1500 m/s. A baseball has a mass of 0.145 kg. What must be its speed if the pitcher's claim is valid?
[Ques. 8] The largest moon in the solar system is
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(a) the Earths moon
(b) Ganymede
(c) Triton
(d) Io
[Ques. 9] Lunar eclipses last longer than solar eclipses because
a) the Moon is much farther from Earth during a lunar eclipse.
b) the diameter of Earth is much greater than the diameter of the Moon.
c) Earth's period of rotation is always greater during a lunar eclipse than during a solar eclipse.
d) the lunar shadow is only a penumbra with no dark umbra region to extend the length of the eclipse.
[Ques. 10] High-speed stroboscopic photographs show that the head of a golf club of mass 200 grams is traveling at 55.0 m/s just before it strikes a 46.0-gram golf ball at rest on a tee. After the collision, the clubhead travels (in the same direction) at 40.0 m/s. Find the speed of the golf ball just after impact.
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