A ventilation fan with a moment of inertia of 0.034 kg·m2 has a net torque of 0.11 N·m applied to it. If it starts from rest, what angular momentum will it have 9.0 s later?
a. 0.88 kg·m2/s b. 0.99 kg·m2/s
c. 2.0 kg·m2/s d. 3.3 kg·m2/s
b
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Spherical Mirrors: An object 2.0 cm tall is placed 24 cm in front of a convex mirror having a focal length of magnitude 30 cm.(a) Where is the image formed and how far is it from the mirror?(b) How tall is the image?
What will be an ideal response?
A particle (mass = 6.0 mg) moves with a speed of 4.0 km/s in a direction that makes an angle of 37° above the positive x axis in the xy plane. At the instant it enters a magnetic field of (5.0
) mT it experiences an acceleration of (8.0
) m/s2. What is the charge of the particle?
A. ?4.8 ?C B. 4.0 ?C C. ?4.0 ?C D. 4.8 ?C E. ?5.0 ?C
Because of the equivalence of mass and energy, an electron and a positron, which are two massive particles, can annihilate when they come together to produce two photons, which have no mass
a. True b. False Indicate whether the statement is true or false
Two blocks are accelerated across a horizontal frictionless surface as shown. Frictional forces keep the two blocks from sliding relative to each other, and the two move with the same acceleration. If F = 1.2 N and M = 1.0 kg, what is the horizontal component (frictional force) of the force of the large block on the small block?
a.
0.40 N to the left
b.
0.80 N to the right
c.
0.40 N to the right
d.
0.80 N to the left
e.
1.20 N to the left