### Question1a rifle is expected horizontally at a target 28m

Assignment Help Physics
##### Reference no: EM13350625

Question1

A rifle is expected horizontally at a target 28m away. The bullet hits the target 2.7 cm below the aiming point. Neglect air resistance. What is the bullet's time of flight? And what is its muzzle velocity?

Question2

Air has an average density of 1.29kg/m^3 near the surface of the earth: (a) research air and find out what percent of it is oxygen? If each breath from a person takes an average of 1/2 L of air, what mass, in grams, does a person breathe in in a day? If the air was to be stored uncompressed in a spherical tank, what would be radius of the tank?

### Write a Review

#### Determine the induced emf in the coil

A 1200 turn coil of wire that is 3.00 cm in diameter is in a magnetic field that drops from 0.750 T to 0 T in 15.0 ms. What is the induced emf in the coil

#### How many moles of water did you make

one mole of water molecules consists of 1 mole of oxygen (16 g) and 2 moles of hydrogne (1 g each). how many moles of water did you make

#### What is the initial velocity of the hanging mass

A string is wound around a metal wheel that is free to spin on a frictionless pivot. A hanging mass is connected to the other end of the string. What is the initial velocity of the hanging mass

#### Find out the position (in m) at time t = 5.67 s

A jetliner is moving at a speed of 216 m/s. The vertical component of the plane's velocity is 79.70 m/s. establishes the magnitude of the horizontal component of the plane's velocity.

#### The stopping distance when the surface is dry

A kid fires water horizontally from a squirt gun held 1.6 above the ground. It hits other kid 2.4 away squares in the back, at a point 0.85 above the ground. What was the initial speed of the water.

#### What is an average power output of the laser

What is an average power output of the laser. What is the rms value of the electric field in the beam.

#### Find the force and the direction of the friction

A block of mass 2.0 kg is pushed against a vertical wall by a horizontal push (P) of 50.0 N. Find the force AND the direction of the friction

#### What are the time they spend accelerating

An X-ray tube gives electrons, which start at rest, a constant acceleration over a distance of 23cm. If their final speed is 1.3 x 107 m/s, what are the time they spend accelerating

#### What maximum film thickness will reflect red light

Oil with index of refracton n=1.25 floats on water with index n=1.33. For normal incidence, what maximum film thickness will reflect red light of wavelength 650nm most strongly

#### What is the radius of circle

The car has just achieved double its initial velocity when the driver spots a police officer behind him and applies the brakes. The car then slows down, coming to rest at the stoplight ahead.

#### Does the observer at c observe constructive

How long will it take you to cover the 99 m length of the walkway if, once you get on the walkway, you immediately turn around and start walking in the opposite direction with a speed of 1.5 m/s relative to the walkway.

#### What is the decrease in kinetic energy of the bullet

A 3.00-g bullet, traveling horizontally with a velocity of magnitude 370 m/s, is fired into a wooden block with mass 0.800 kg, What is the decrease in kinetic energy of the bullet