Physics Kinematics Level: Misc Level
An elevator is moving upward with a speed of 11 m/s. Three seconds later, the elevator is still moving upward, but its speed has been reduced to 5.0 m/s. What is the average acceleration of the elevator during the 3.0 s interval?
a.2.0 m/s2, downward
b.2.0 m/s2, upward
c.5.3 m/s2,downward
d.5.3 m/s2, upward
e.2.7 m/s2,downward
Physics Kinematics Level: Misc Level
A racecar,traveling at constant speed, makes one lap around a circular track of radius r in a time t [NOTE; the circumference of a circle is given by C=2 nr]. Determine the magnitude of the average velocity of the car for one complete lap.
a.r/t
b.2r/t
c.n/t
d.2nr/t
e.zero m/s
Physics Kinematics Level: Misc Level
For which one of the following situations will the path length equal the magnitude of the displacement?
a.A jogger is running around a circular path.
b.A ball is rolling down an inclined plane.
c.A train travels 5 miles east; and then, it stops and travels 2 miles west.
d. A ball rises and falls after being thrown up from the earth, s surface.
e.A ball on the end of a string is moving in a vertical circle.
Physics Vectors Level: Misc Level
Three vectors A, B, and C add together to yield zero; A+B+C=0. The vectors A and C point in opposite directions and their magnitudes are related by the expression; A=2C. Which one of the following conclusions is correct?
a.A and B have equal magnitudes and point in opposite directions.
b.B and C have equal magnitudes and point in same direction.
c.B and C have equal magnitudes and point in opposite directions.
d.A and B point in the same direction, but A has twice the magnitude of B.
e. B and C point in the same direction, but C has twice the magnitude of B.
Physics Measurements Level: Misc Level
A certain physical quantity,R, is calculated using the formula;4 a2 (b-c) where a, b, and c are distances. What is the SI unit for R?
a. cm
b. cm2
c. m
d.m2
e. m3
Physics Electrostatics Level: Misc Level
A raindrop inside a thundercloud has a charge-8e. What is electric on the raindrop if the electric field at its location (due to other charges in the cloud) has magnitude of 2.0 x 106 N/C and is directed up?
Physics Electrostatics Level: Misc Level
Power lines have a limit on the maximum size of the electric field they produce. In most states a maximum of 5 kN/C at about 20 m from the wires is allowed. This is quite large compared to the Earth,s fair-weather electric field of about 100 N/C. Assume that the charge on the wire is static (not true, but a simplification here) and use the formula for the electric field of a wire to determine how much charge per unit length is on the wire.
Physics Electrostatics Level: Misc Level
A solid sphere of charge of radius R has a total charge of q uniformly spread throughout the sphere. (a) Find the magnitude of the electric field for>=R. (b)Find the magnitude of the electric field for r<=R. (c) Sketch a graoh of E (r) for 0<=r<=3 R.
Physics Electrostatics Level: Misc Level
In fair weather,over flat ground, there is a downward electric field of about 150 N/C.(a) Assume that Earth is a conducting sphere with charge on its surface. If the electric field just outside is 150 N/C radially inward,calculate the total above the Earth,s surface, the field is only 120 N/C. Calculate the charge density (charge per unit volume) of the air (assumed constant).
Physics Electrostatics Level: Misc Level
Two point charges, q1=+20.0 nC and q2=+10.0 nC are located on the x- axis at x=0 and x=1.0 m, respectively. Where on the x-axis is the electric field equal to zero?
Physics Electrostatics Level: Misc Level
A small sphere with a charge of -6.0 x 10^-7 Cis placed in a uniform electric field of magnitude 1.2 x 106 N/C pointing to the west. What is the magnitude and direction of the force on the sphere due to the electric field?
Physics Electrostatics Level: Misc Level
AK+ and a CI-ion are directly across from each other on opposite sides of a membrane 9.0 nm thick. What is the electric force on the K+ due to the CI -ion? lgnore the presence of other charges.
Physics Electrostatics Level: Misc Level
Three point charges are fixed in place in a right triangle. One charge of -0.60 uC at location(0,0)on an X-Y axis. The second charge of +0.80 uC at location (0,8) on an X-Y axis. The third charge of +1.0 uC at (6,0) on an X-Y axis. What is the electric force on the -0.60 uC charge due to the other two charges.
Physics Electrostatics Level: Misc Level
Suppose a 1.0-g nugget of pure gold has zero net charge.What would be its net charge after it has 1.0% of its electrons removed?
Physics Force & Laws Of Motion Level: Misc Level
Two people pull on a stubborn mule. (a) the single force that is equivalent to the two forces shown, and (b) the force that a third person would have to exert on the mule to make the net force equal to zero.
