Physics Answers

How do you compute the force of attraction between a +1.60 × 10 C charge and a -2.09 × 10C charge if they are 4.01 × 10 m apart?

An object is placed in front of a convex mirror, and the size of the image is one-fourth that of the object. What is the ratio do/f of the object distance to the focal length of the mirror?

A.+3

B.-3

C.-2

D.+2

a 15 gram gun fires a bullet a a muzzle velocuty of 600 m/s. What is the recoil velocity of the gun?

Tom who is traveling at a speed of 67 km/hr sees Jerry 178 m away on the road. What is the minimum constant acceleration must Tom have to avoid Jerry assuming he doesn't move.

Given, Sketch, and Solution of 

A large gun fires a shell with a muzzle velocity of 400m/sec. What is the range of the gun when it is elevated at ang angle of 30? and 50?

Given, Sketch, And Solution of the problem?

A cannon is mounted on a railroad car. The cannon fires a 1.75kg ball with a muzzle velocity 300.m/s to the left. The mass of the cannon-car combo is 4500.kg. if all is initially at rest, what is the recoil velocity of the cannon-car?

A steel railroad rail expands and contracts according to the formula Δl = 𝛼lΔT,

where Δl is the change in length, 𝛼 is a constant called the coefficient of linear expansion, l is the original length, and ΔT is the change in temperature. If a 50.0 ft steel rail is installed at 0°F, how many inches will it expand when the temperature rises to 190°F? (𝛼 = 6.5 ✕ 10⁻⁶/°F.

A typical light wave has a wavelength of 580 nanometers (580 x 10-9 m).  

 If the speed of light is 3.0 x 108 m/s what is the frequency of the typical light wave?

Four people are pushing a body with forces:

310N in the direction 045

280N in the direction 135

400N in the direction 80. Calculate sum of vertical and sum of horizontal component respectively.?