Physics Answers

a horizontal snowy road at a

A 25.0-kg sled is being pulled across constant velocity. The pulling force is parallel to the horizontal road and the coefficient of kinetic friction between the sled and snow is 0/1 . Determine the magnitude of the pulling force.

Earth orbits the sun once every 365.25 days.

Find the average angular speed of Earth

about the sun.

Answer in units of rad/s.

The damage threshold for the retina is 100 W/m^2. This means that a damage to the retina can occur at an average intensity greater than this. The light coming from a 5.0 mW green laser has a diameter of 1.2 mm. (a) Will this laser exceed the damage threshold for the retina? (b) What are the maximum values of the electric and magnetic fields of the beam coming from this laser?

Find the measurement of the angle of refraction

An ideal gas that occupies 1.2m3 at a pressure of 1 x 105 Pa and a temperature of 27C is compressed to a volume of 0.6m3 and heated to a temperature of 227C. What is the new pressure? 

What is central force

Two spherical objects have masses of 8000kg and 1500 kg. Their centers are separated by a distance of 1.5m. Find the gravitational attraction between them.

A bus is moving at 5.0 m/s when a passenger walks forward at 1.5 m/s relative to the bus. How fast is this passenger moving as seen and measured by (a) a person waiting at the bus stop and (b) the driver of the bus?

Three 3.0ohms resistors are connected parallel. What is the equivalent resistance?

A projectile is fired in such away that its horizontal range is equal to its maximum height what is the angle of projection ?