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A capacitor of capacitance micro-microfarads consists of two parallel plates each moving an area of 200 cm¹, separated in air a distance d apart. This condenser is charged to a difference in potential of 200 V and it is then disconnected from the source. Find (a) the distance of separation d. (b) the charge stored in the condenser. (c) the work done in storing this charge, and (d) the work needed to pull the plates apart to a distance of 3d.
A boy traveled 10 meters to the east and then he turned 4 meters to the North. What is his resultant displacement.
Kara Less was applying her makeup when she drove into South's busy parking lot last Friday morning. Unaware that Lisa Ford was stopped in her lane 30 feet ahead, Kara rear-ended Lisa's rented Taurus. Kara's 1300-kg car was moving at 11 m/s and stopped in 0.14 seconds. 3pts each
a. Determine the momentum change of Kara's car.
b. Determine the impulse experienced by Kara's car.,
c. Determine the magnitude of the force experienced by Kara's car.
Two protons are separated by a distance of 3.6×10^10 m in air
A. find the magnitude of the electric force once protons exerts on other. is the force attractive or repulsive?
B. find the magnitude of the gravitational force once proton is exerts on the other. is this force attractive or repulsive?
Compute the electric force between two charges of 5×10-9 C and -3×10-8 C which are separated by r=10 cm
A 10 cm object is located 15 cm from the concave mirror with the focal length of 5 cm. An Image 7 cm from the mirror is detected, find its height
“A train of mass 120,000 kg is moving with velocity of 10m/s and is acted upon by a forward force of 7000 N due to engine and frictional force of 750 N. What will be the velocity of the train after 1,000 seconds?”
A hockey player makes a slap shot, exerting a
force of 37.2 N on the hockey puck for 0.147 s.
What impulse is given to the puck?
Answer in units of kgm/s.
What is the wavelength in air under standard conditions of a compressional wave
whose frequency is 250 per second? Assume that the bulk modulus for air is 1.40
x 106 dyn/cm2 and the density of air is 1.29 g/L.
The velocity of light in a liquid is 0.80 as fast as it is in air. What is the index of
refraction of the liquid?
