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# Physics

Vita Kulas

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2021-10-17 18:35:23
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Cards in this guide (28)
What unit is used to measure resistance

ohm

What unit is used to measure current

In a wire . . . . . ampere

In a river . . . . . mile per hour

More detail for the electrical answer

The ampere, often abbreviated to amp or A.

The unit is named after the French physicist André Marie Ampère.

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A current of 1A is equal to 1 coulomb of charge passing a point in 1 second.

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The ampere is the unit of current. It is approximately 6.24 × 1018 electrons passing a given point each second. See the Related Link shown below for more detail.

Two resistors are connected in series to a 9 volt battery The larger resistor provides twice as many ohms resistance as the smaller one The current through the circuit is 3 amps What is the resista

2

What is the gravitational force between a mass of 20 kg and a mass of 100 kg that are 15 meters apart

5.9 x 10^-10 N

A 120 ohm resistor a 60 ohm resistor and a 40 ohm resistor are connected in parallel to a 120 volt power source What is the current running through the 60 ohm resistor

2.0 or two

A 75 ohm light and a 150 ohm heater are connected in parallel to a 150 volt power source What is the current through the 150 ohm heater

The current through the 150 ohm heater is 1 amp.

A step-up transformer has 300 turns on its primary coil and 90000 turns on its secondary coil If the current flowing through the secondary is 5 amps What is the current flowing in the primary

150 amperes

The process of creating electricity in one place and moving it to another for use

transmitting

A string of 15 Christmas tree lights is connected in series to a 90 volt power source What is the value of the resistance of each light if the current flowing through the circuit is 2 amps

3
3 ohms

A ray of light strikes a flat surface of water The angle that the incoming light ray makes with the normal is called the angle of

incident

Two hundred liters of gas at zero degrees Celsius are kept under a pressure of 150 kPa The temperature of the gas is raised to 273 degrees Celsius and the pressure is increased to 600 kPa New temp

500

The apparent change in the frequency of a sound emitted by a moving object as it passes a stationary observer is called the what effect

Doppler effect.

A transformer has 150 turns on the primary coil and is connected to a 120 volt power source How many turns will be needed on the secondary coil to provide a secondary voltage of 600 volts

600 volts is five times the 120 volt primary, so the secondary winding must have 750 turns, which is five times as many turns as the 150 turns of the primary winding.

A 120 ohm resistor a 60 ohm resistor and a 40 ohm resistor are connected in parallel to a 120 volt power source What is the current running through the 40 ohm resistor

3 amps

A string of 20 Christmas tree lights are connected in series to a 20 volt power source The bulbs each have a resistance of .5 ohm How much current is flowing through the circuit

2 amps. If it is D.C.

Five resistors are connected together in series One resistor is 2 ohms one is 3 ohms one is 4 ohms one is 5 ohms and the fifth is 6 ohms What is the total resistance

A 120 ohm resistor a 60 ohm resistor and a 40 ohm resistor are connected in parallel to a 120 volt power source What is the effective resistance of the three resistors

Reff = R1*R2 / (R1+R2)

if you follow this for all three, you will end up with 20 ohms.

A ramp is 30 meters long and 5 meters high 200 newtons of force must be applied by the mover to push a 1000 newton piano up the ramp What is the amount of work accomplished by the ramp

5,000 joules

A 120 ohm resistor a 60 ohm resistor and a 40 ohm resistor are connected in parallel to a 120 volt power source What is the current running through the 120 ohm resistor

1amp

Light wave is composed of two components an electrical component and a component

magnetic

After an approaching ambulance passes a stationary observer what does the frequency of the sound of the siren heard by the observer appear to do

It decreases.

This is not just apparent. The frequency emitted by the siren is constant, but the frequency arriving at the observer really does change.

A pulley system is used to lift a 2000 newton engine up a distance of 3 meters The operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor To lift the engine fi

250 newtons

Under a pressure of 200 kPa a confined gas has a volume of 2500 cubic meters The pressure acting on the gas is increased to 500 kPa What is the new volume of the gas if the temperature remains the sam

A 5 ohm resistor a 10 ohm resistor and a 15 ohm resistor are connected in a series to a 120 volt power source what is the amount of current flowing between the 5 ohm resistor and the 10 ohm resistor

The current would be about 20 volts.

The speed of sound in water is 1430 meters per second Find the wavelength of a sound with a frequency of 286 Hz traveling through the water

5 meters

What is the speed of a sound wave that has a wavelenght of 102 meters and a frequency of 250hz

speed = wavelength * frequency wavelength = 102 meters

frequency = 250 Hz = 250 cycles/second

102 * 250 = 25500 meters/second

What is the total current flowing through a 45 ohm resistor 1.4 amps and 20 ohm resistor 1.8 amps

Just add the amps (3.2 amps).

What voltage is applied to a 4 ohm resistor if the current is 1.3 amps

5.2

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