June 2019 Physics Regents Questions 11-20 Question Preview (ID: 59785)

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What is the kinetic energy of the second ball when it hits the ground? Neglect friction.

a) 200 J

b) 400 J

c) less than 200 J

d) more than 200 J

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

a) the same

b) twice as great

c) half as great

d) four times 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

a) 1.0 × 10^3 eV

b) 2.0 × 10^3 eV

c) 3.0 × 10^3 eV

d) 4.0 × 10^3 eV

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?

a) 0.200 A

b) 5.00 A

c) 5.00 × 10^4 A

d) 1.25 × 10^18 A

An aluminum wire of length 1.0 meter has a resistance of 9.0 × 10^-3 ohm. If the wire were cut into two equal lengths, each length would have a resistance of

a) 2.8 × 10^–8 Ω

b) 4.5 × 10^–3 Ω

c) 9.0 × 10^–3 Ω

d) 1.8 × 10^–2 Ω

In an operating electrical circuit, the source of potential difference could be

a) a voltmeter

b) a battery

c) an ammeter

d) a resistor

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?

a) 0.52 W

b) 0.78 W

c) 4.4 W

d) 6.5 W

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

a) 0.0 N

b) 80.0 N

c) 100. N

d) 125 N

What is the direction of the magnetic field at point P?

a) 1

b) 2

c) 3

d) 4

A student claps his hands once to produce a sudden loud sound that travels through the air. This sound is classified as a

a) longitudinal mechanical wave

b) longitudinal electromagnetic wave

c) transverse mechanical wave

d) transverse electromagnetic wave

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