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# Speed of Light

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### Linear Momentum and a Toyota and Cadillac Collision

A 0.90X10^3 kg Toyota collides into the rear end of a 2.2X10^3 kg Cadillac stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 4.0 m before stopping. The police officer, knowing that the coefficient of kinetic friction between tires and road is 0.40, calculates the speed of the Toyota a

### Find the equation that is used to calculate the Schwarzschild radius of a black hole. Calculate the Schwarzschild radius of this candidate black hole.

Black holes are strange astronomical objects that are formed from collapsed stars. These fascinating stellar objects are named "black holes" because the gravitational pull due to the collapsed star is so large that they do not even allow light to escape once it has entered the black hole. There is a "point of no return" in the b

### Calculating the speed of light

The edge of the universe is expanding at the speed of the light. How fast is this in km/hr?

### Speed and Mass Ratios

Calculate the ratio of v/c and m/m_o for a) 100 keV electron b) 1 MeV electron c) 1 MeV proton d) 100 MeV proton Note: m_o is rest mass

### Speed and Velocity Solved

1) Two trains, one traveling at 68km/h and the other at 136km/h. They are headed toward one another along a straight level track. When they are 867m apart each engineer sees the other's train and applies brakes. The brakes decelerates each train at the rate of 1.0m/s^2. Is there a collision? a) Yes b) No b) What distanc

### Derivatives (Distance, Speed)

A lighthouse is located on a small island 3 km away from the nearest point P on a straight shoreline and its light makes four revolutions per minute. How fast is the beam of light moving along the shoreline when it is 1 km from P?

### Calculating Frequency and Energy

Violet light has a wavelength of about 410 nm. What is its frequency? Calculate the energy of one photon of violet light. What is the energy of 1.0 mol of violet light photons? Compare the energy of photons of violet light with those of red light. Which is more energetic and by what factor? Frequency of violet light:____

### Sunlight reaching the earth

How long does it take for sunlight to reach the earth?

### Gas cylinder: Ventilation, pressure, quantity, flow

See attached file for proper format of symbols. 6. There is a gas cylinder filled with oxygen in front of you. It is 1.5 meters tall, and 30 centimeters in diameter. The oxygen within the cylinder has dropped to a gauge pressure of 2.52 x 106Pa at a temperature of 20Â°C. This pressure is insufficient to ventilate a patient in

### Amplitude: Speed of sound waves in water, acoustic intensity, pulses, incident energy, piano note frequencies, isotropic point sources of sound

1. The speed of sound waves in water (density 1.00 x 10 3 kg/m 3 ) is c=1480 m/s. [2] (a) What is the average intensity (in W/m 2 ) of a 1000 Hz sound wave in water if the displacement amplitude of the wave is 1.00 nm? (1 nm=10 -9 m). [2] (b) What is the ratio of pressure amplitude to displacement amplitude in this wave?

### Speed of sound and Light - calculating time and distance

During a thunderstorm, we first see the lightning and then hear the thunder. Assume that clouds and storm occur in the lower reaches of the earth's atmosphere, which is approximately 5km above the earth's surface. How long after you see the lightning do you hear the thunder?

### Speed limit when you drive at night - The Physics

Explain how the range of a car's headlights limits the safe driving speed at night

### Calculate the speed of light in a substance given the index of refraction.

The index of refraction of carbon tetrachloride is 1.46. The speed of light in this material is: A) less than 1.00 x 10^6 km/s B) between 1.00 x 10^6 and 2.00 x 10^6 km/s C) between 2.00 x 10^6 and 3.00 x 10^6 km/s D) greater than 3.00 x 10^6 km/s

### Time dilation test

Two observers agree to test time diliation. They use identical clocks, and one observer in frame s' moves with speed v=0.6c relative to the other observer in s. When their origins coincide, they start thier clocks. They agree to send a signal when their clocks read 60 minutes and to send a confirmation signal when each receiv