Physics Answers

The inner tube of a Pyrex glass mercury thermometer has a diameter of 0.120 mm. The bulb at the bottom of the thermometer contains 0.420 cm³ of mercury. How far will the thread of mercury move for an increase of 1.00°C? Remember to take into account the expansion of the glass. Coefficient of Linear Expansion of Glass(Pyrex) is 3.25 × 10⁻⁶ K⁻¹ and Coefficient of Volume Expansion of Mercury is 182 × 10⁻⁶ K⁻¹.

Determine the force of gravitational attraction between the earth (m = 5.98 x 10²⁴ kg) and a 63.0-kg man if the man is standing at sea level, a distance of 6.38 x 10⁶ m from earth's center.

3. A point charge Qa = 3uC is located at point (0, 0) and another point Qb = - 7uC has the coordinates of (2, 3).

a) Find the electric force on charge Qa.

b) Is the force attractive or repulsive? Why?

A golf ball with a mass of 0, 1 kg is driven from the tee. The golf ball experiences a force of 1000 N while in contact with the golf club and moves away from the golf club at 30 m·s-1. Calculate the time during which the golf club was in contact with the ball. 

An incident ray strikes a glass (n=1.52) with an angle of 380 to the surface of the glass.

A. Illustrate with label angle of incidence, angle of reflected ray and angle of refraction.

B. What is the angle of reflected ray?

An electric field with a strength of 1.25x104N/C exerted 2.50 N on a certain test charge, q. Determine the charge on q.

When positioned at 90° to a magnetic field, a wire of length 1 m carrying a current of 4 A experiences a force of 0.2 N. What is the strength of the magnetic field?

An electric field with a strength of 1.25x104N/C exerted 2.50 N on a certain test charge, q. Determine the charge on q.

1. A package is dropped from a helicopter flying at a height of 7.5 m while traveling 15 m/s. how far does the

package travel horizontally before it hits the ground below?

2. An orange rolls across with a speed of 0.5 m/s and falls off the edge. If it lands 3 m from the edge of the table,

from what height does it fall?

A kicked football leaves the ground at an angle θ = 45^o with the horizontal has an initial speed of 25 m/s. Determine the distance of X. Acceleration due to gravity is 9.8 m/s².