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In an operating electrical circuit, the source of potential difference could be
100. N
200 J
longitudinal mechanical wave
3
0.78 W
a battery
4.0 × 10^3 eV
half as great
Two construction cranes are used to lift identical 1200-kilogram loads of bricks the same vertical distance. The first crane lifts the bricks in 20. seconds and the second crane lifts the bricks in 40. seconds. Compared to the power developed by the
100. N
200 J
longitudinal mechanical wave
3
0.78 W
a battery
4.0 × 10^3 eV
half as great
A student claps his hands once to produce a sudden loud sound that travels through the air. This sound is classified as a
100. N
200 J
longitudinal mechanical wave
3
0.78 W
a battery
4.0 × 10^3 eV
half as great
A 40.0-kilogram child exerts a 100.-newton force on a 50.0-kilogram object. The magnitude of the force that the object exerts on the child is
100. N
200 J
longitudinal mechanical wave
3
0.78 W
a battery
4.0 × 10^3 eV
half as great
What is the kinetic energy of the second ball when it hits the ground? Neglect friction.
100. N
200 J
longitudinal mechanical wave
3
0.78 W
a battery
4.0 × 10^3 eV
half as great
What is the direction of the magnetic field at point P?
100. N
200 J
longitudinal mechanical wave
3
0.78 W
a battery
4.0 × 10^3 eV
half as great
A lightbulb with a resistance of 2.9 ohms is operated using a 1.5-volt battery. At what rate is electrical energy transformed in the lightbulb?
100. N
200 J
longitudinal mechanical wave
3
0.78 W
a battery
4.0 × 10^3 eV
half as great
An ionized calcium atom has a charge of +2 elementary charges. If this ion is accelerated through a potential difference of 2.0 × 10^3 volts, the ion’s change in kinetic energy will be
100. N
200 J
longitudinal mechanical wave
3
0.78 W
a battery
4.0 × 10^3 eV
half as great
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