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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
4.0 × 10^3 eV
a battery
100. N
200 J
longitudinal mechanical wave
half as great
0.200 A
0.78 W
In an operating electrical circuit, the source of potential difference could be
4.0 × 10^3 eV
a battery
100. N
200 J
longitudinal mechanical wave
half as great
0.200 A
0.78 W
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
4.0 × 10^3 eV
a battery
100. N
200 J
longitudinal mechanical wave
half as great
0.200 A
0.78 W
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?
4.0 × 10^3 eV
a battery
100. N
200 J
longitudinal mechanical wave
half as great
0.200 A
0.78 W
A total charge of 100. coulombs flows past a fixed point in a circuit every 500. seconds. What is the current at this point in the circuit?
4.0 × 10^3 eV
a battery
100. N
200 J
longitudinal mechanical wave
half as great
0.200 A
0.78 W
What is the kinetic energy of the second ball when it hits the ground? Neglect friction.
4.0 × 10^3 eV
a battery
100. N
200 J
longitudinal mechanical wave
half as great
0.200 A
0.78 W
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
4.0 × 10^3 eV
a battery
100. N
200 J
longitudinal mechanical wave
half as great
0.200 A
0.78 W
A student claps his hands once to produce a sudden loud sound that travels through the air. This sound is classified as a
4.0 × 10^3 eV
a battery
100. N
200 J
longitudinal mechanical wave
half as great
0.200 A
0.78 W
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