Buzztutor Questions and Answers by Category

3746

Physics Electrostatics Level: University

Capacitor
Consider the earth and a cloud layer 840 m above the Earth to be the plates of a parallel-plate capacitor. Assume that the cloud layer has an area of 1.14 km^2 = 1.14 X 10^6 m^2. If an electric field strength greater than 3.27 X 10^6 V/m causes the air to break down and conduct charge ( lightning) What is the maximum charge the cloud can hold?

3745

Physics Electrostatics Level: University

Potential and field intensity
Consider an electron between the plates of a charged capacitor.The figure below shows a situation where the potential difference across the capacitor (V) and the separation between the capacitor plates (d) vary, The values for six specific situations are given below.
Rank them in order of increasing magnitude of the force felt by the electron from smallest to largest
(If B is smallest then A C D and finally E is largest enter BACDE)
( Note: If of equal magnitude then enter in the order listed)
A. d = 3m         V= 100 volts
B. d = 3m        V = 60 volts
C. d = 4.5m    V = 90 volts
D. d = 4.5m       V = 150 volts
E. d = 3m          V = 60 volts
F. d = 3.5m      V = 100 volts

3744

Physics Force & Laws Of Motion Level: University

Component of vector
A hanging sign which weighs 50 N is pished out from the wall by a bracket and supported by a rope tied to the wall. The rope makes an angle of 30 degrees with the wall. Find the force of tention in the rope.

3743

Physics Force & Laws Of Motion Level: University

Vector
An Airplane is flying towards a destination 320 km due east of its starting point. There is a wind of 50 km/h from the northwest ( towards bearing 135). The pilot wishes to make the trip in 40 minutes. What should his airspeed vector be? ( The diagram is essential)

3742

Physics Force & Laws Of Motion Level: University

Vector
Sarah rows a boat across a river that is flowing at a steady 3km/h.She keeps the boat pointing straight across maintaining a rowing speed of 5 km/h. The river is 1 km wide.
a. From a vector diagram find the actual crossing speed and direction of sarah's boat.
b. Find the time it takes to cross the river
c. Find the distance down river that sarah reaches the shore.

3741

Physics Force & Laws Of Motion Level: University

Vector
A rock of a weight 200N is resting on an incline which makes an angle of 30 degrees to the horizontal. Find the component of the weight force that makes the rock inclined to slide down the incline.

3740

Physics Force & Laws Of Motion Level: University

Vector
Given the vectors A (10N) and B (8N) at an angle of 143 degrees to each other. Find the vector A-B

3739

Physics Force & Laws Of Motion Level: University

Vector
Find the resultant of two forces 5N and 6N. at an angle of 20 degrees to each other.