Physics Answers

Directions: Answer the following questions. Show your solutions.

1. If static force is144 N, what is the distance between both charges given that charge 1 is 10μC and charge 2 is 4μC?

2. Two charges separated by a distance of r. if the static force is 3.6N, what is the distance between q1=9μC and q2=4μC.

3. How much force is experienced by the 5nC charge due to the other charges, if there are 3 charges; q1=5nC, q2=-9nC, q3=4nC are placed at the vertices of an equiangular triangle with a side measuring 15cm.

A 3kg object travels in a uniform circle at a constant speed of 12m/s. The centripetal force acting on the object is 110 Newtons.

Calculate the time required for the the object to complete one full circle.

A 3kg object travels in a uniform circle at a constant speed of 12m/s. The centripetal force acting on the object is 110 Newtons.

Calculate the weight of the object

A bullet leaves the barrel of a gun at a speed or 320 m/s at an angle of 45 degrees above the horizontal. At the moment the bullet leaves the barrel, the acceleration of the bullet is:

A. 0

B. 320m/s to the right

C. 9.8m/s upward

D. 9.8m/s downward

An automobile with an initial speed of 3.40 m/s accelerates uniformly at the rate of 6.0 m/s². Find the final speed after 5s.

A ball traveling in the +x direction hits the wall at 30m/s and rebounds at 25m/s. If the ball is in contact with the wall for 4ms, determine the average acceleration of the ball during this time interval.

How many coulontos of charge move across a 120 V source when 1440 J of energy is

required?

A sphere of radius R carries a charge of volume charge density ρ ar, where a is a constant and r denotes the distance from the centre of the sphere. Calculate the total charge enclosed by the sphere and the electric field at points lying inside and outside the sphere. 

1. A small electric immersion heater is used to heat 68 g of water for a cup of instant coffee. The heater is labeled “76 watts” (it converts electrical energy to thermal energy at this rate). Calculate the time required to bring all this water from 23°C to 100°C, ignoring any heat losses. (The specific heat of water is 4186 J/kg·K.)

1. A vertical glass tube of length L = 1.3m is half filled with a liquid at 15.8 ˚C. How much will the height of the liquid column change when the tube is heated to 34.0 ˚C? Take α_glass = 1.25× 10^-5/K and β_liquid = 4.46× 10^-5/K.

19.Find the capacitance of Earth. The radius of the Earth is 6,400 km By how much will the Earth's potential change if it receives a quantity of electricity equal to 1C?