What characteristic of a star primarily determines its location on the main sequence?
a. age
b. distance from the galactic center
c. mass
d. space motion
e. radius
c
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Projectile Motion: Enzo throws a rock horizontally with a speed of 12 m/s from a bridge. It falls for 2.28 s before reaching the water below with no appreciable air resistance. Just as the rock reaches the water, find(a) the horizontal component of its velocity.(b) the speed with which it is moving.
What will be an ideal response?
A rectangular loop (area = 0.15 m2) turns in a uniform magnetic field with B = 0.20 T. At an instant when the angle between the magnetic field and the normal to the plane of the loop is (?/2) rad and increasing at the rate of 0.60 rad/s, what is the magnitude of the emf induced in the loop?
a. 24 mV b. zero c. 18 mV d. 20 mV e. 6.0 mV
The potential applied to a 20-? resistor is (60 V) cos(33t). What is the average power consumed in the resistor?
What will be an ideal response?
A star like the Sun emits a(n) ____ spectrum
a. absorption b. emission c. continuous d. Doppler e. ionization