Physics Electrostatics Level: High School
A 2.0 g ball hangs as a pendulum from a very thin thread. It hangs at an angle of 30 degrees when placed in a horizontal field of 5.0 x 10 to the 4th N/C . What is the charge on the ball ?
Physics Electrostatics Level: High School
At what distance from a -5 micro C point charge is the electric field 200 N/C ? Is the electric field there directed radially inward or outward ?
Physics Electrostatics Level: High School
In a certain region of space an electron experiences a force of 3.0 x 10 to the -16th N in the + x direction . What are the magnitude and direction of E in that region ?
Physics Electrostatics Level: High School
Five identical 3.0 micro C exist in a plane . Four are the vertices of a square that has 7.0 m long sides. The fifth is at the center of the square . Find the force on one of the corner charges if the center charges is negative and the others are positive .
Physics Electrostatics Level: High School
The following three charges exist on the x axis : + 5.0 micro C at x = 0 , -3.0 micro C at x = 20 cm , -7.0 micro C at x = 50 cm . Find the magnitude and direction of the force on the -7.0 micro C charge .
Physics Electrostatics Level: High School
Two small identical metal sphere carry charges of + 0.30 micro C and -0.40 micro C.(a) The spheres are 5.0 m apart. Find the force one exerts on the other
(b) The spheres are touched together and again separated to 5.0 m . What force does one now exert on the other ?
Physics Electrostatics Level: High School
Two point charges have values + 5.0 micro C and -7.0 micro C . The +5 micro C charge is at x = 0 whereas the -7 micro C is at x = 30 cm on the x axis.(a) Find the magnitude and direction of the force on the -7 micro C charge .
(b) Repeat for the +5 micro C charge .
Physics Heat & Thermodynamics Level: High School
If 45.3 ml of water at 35.03 is added to an unknown amount of water at 10.0 C and the final temperature of the mixture is 35.4 C , What was the mass of the water 10.0 C ?
Physics Heat & Thermodynamics Level: High School
How many joules are required to raise the temperature of 65.7 ml of ethyl alcohol from 25.4 to 45.3 C ?
Physics Heat & Thermodynamics Level: High School
An amount of silver at 95.6 C is added to 85.0 ml of water at 45.0 C and the final temperature of the water is 59.4 C , What amount of silver was added ?
Physics Heat & Thermodynamics Level: High School
If 73.5 g of lead at 73.0 C is added to water at 25.0 C and the final temperature of the mixture is 53.0 C , what is the mass of the water ?
Physics Misc Topic Level: Misc Level
(A)Consider the collision of two identical particles , where the intial velocity of the particle 1 is v1 and particle 2 is initially at rest . After an elastic head-on collision , the final velocity of particle 2 v’2 is given by .1. v’2 = 0
2. v’2 = v1/4
3. v’2 = 3 v1/4
4. v’2 = 2 v1
5. v’2 = 2 v1/3
6. v’2 = v1/2
7. v’2 = v1/3
8. v’2 = 5 v1/3
9. v’2 = v1
10. v’2 = 4v1/3
(B)
Next replace particle 1 by a sledge hammer with mass m1 = 10 kg, particle 2 by a golf ball with a mass m2 = 10g. Consider the elastic head-on collision between the hammer and the ball.The initial velocity of the sledge hammer is v1 = 10 m/s , the golf ball is initially at rest . Estimate the approximate final speed v’2 of the golf ball .
1. v’2 = 2 v1
2. v’2= 5 v1
3. v’2= 10 v1
4. v’2= 20 v1
5. v’2= 500 v1
6. v’2= 50 v1
7. v’2= 100 v1
8. v’2= v1
9. v’2= 200 v1
10.v’2= 1000 v1
Physics Force & Laws Of Motion Level: High School
A disc of mass m moves horizontally to the right with speed v on a table with negligible friction when it collides with a second disc of mass 3 m . The second disc is moving horizontally to the right with speed v/9 at the moment of impact . What is the speed of the composite body immediately after the collision ?1. vf = 2/9 v
2. vf = 4/9 v
3. vf = 5/14 v
4. vf = 5/9 v
5. vf = 3/10 v
6. vf = 1/2 v
7. vf = 11/36 v
8. vf = 9/16 v
9. vf = 1/3 v
10. None of these are correct.
Physics Force & Laws Of Motion Level: High School
Collision
Two identical ball (labeled A and B ) move on a frictionless horizontal tabletop . Initially , ball A moves at speed uA,O = 10 m/s while ball B is at rest (uB,O = 0)The two balls collide off-center , and after the collision ball A moves at speed uA = 6 m/s in the direction theta A = 53 degree from its original velocity vector :
Which of the diagram which is shown at “click here” best represents the motion of ball B after the collision ?
Physics Force & Laws Of Motion Level: High School
Calculate the magnitude of the linear momentum for each of the following cases ;A). A proton with mass 1.67 x 10^-27 kg moving with a speed of 4860000 m/s .
B) A 15.2 g bullet moving with a speed of 344 m/s
C) A 78.1 kg sprinter running with a speed of 10 m/s .
D) Earth (mass = 5.98 x 10^24 kg) moving with an orbital speed equal to 27149.5 m/s . Answer in units of kg . m/s .
