If the net work W is done on an object is positive, the object's kinetic energy increases by an amount W
Indicate whether the statement is true or false
TRUE
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An ac series circuit consists of a voltage source of frequency 60 Hz and voltage amplitude V, a 533-? resistor, and a capacitor of capacitance 6.4 µF
What must be the source voltage amplitude V for the average electrical power consumed in the resistor to be 989 W? There is no inductance in the circuit.
We want to determine experimentally the specific heat of a 3-gram iron ingot whose mass is known. The ingot is heated to 100°C and it is placed in a 200-gram sample of water whose initial temperature is 20°C. We would expect the final temperature of the water to be around
1.100°C. 2.70°C. 3.40°C. 4.20°C.
Using dimensional analysis, which one of the following equations is dimensionally correct? ( a ? m/s2, v ? m/s, x ? m , t ? s)
A) x = v/t B) v = 2ax C) t2 = x/a D) x2 = 2av E) x = a t
In coming to the conclusion that lightbeams are bent by gravity, Einstein reasoned that
A) increased mass at higher velocities causes increased gravitational effects, so lightbeams moving at lightspeed should have gravitational effects. B) since all observers experience the same laws of physics, Newton's theory of gravity must apply to lightbeams. C) since lightspeed is the same for all observers, moving observers would observe that lightbeams bend. D) fast-moving observers would find that lightbeams bend, so gravity must also bend lightbeams. E) accelerated observers would find that lightbeams bend, so gravity must also bend lightbeams.