Resistors of values
R1 = 6.00 ,
R2 = 4.00 ,
R3 = 10.0 , and
R4 = 7.00 are combined as shown. What is the equivalent resistance for this combination?
a.
2.30
b.
3.00
c.
10.7
d.
27.0
[Ques. 2] A ball thrown vertically from ground level is caught 3.0 s later when it is at its highest point by a person on a balcony which is 14 m above the ground. Determine the initial speed of the ball.
a. 19 m/s
b. 4.7 m/s
c. 10 m/s
d. 34 m/s
e. 17 m/s
[Ques. 3] A rock is thrown downward from an unknown height above the ground with an initial speed of 10 m/s. It strikes the ground 3.0 s later. Determine the initial height of the rock above the ground.
a. 44 m
b. 14 m
c. 74 m
d. 30 m
e. 60 m
[Ques. 4] Which resistor is in series with resistor R?
a.
R1 b.
R2 c.
R3 d.
R4
[Ques. 5] A toy rocket, launched from the ground, rises vertically with an acceleration of 20 m/s2 for 6.0 s until its motor stops. Disregarding any air resistance, what maximum height above the ground will the rocket achieve?
a. 1.1 km
b. 0.73 km
c. 1.9 km
d. 0.39 km
e. 1.5 km
[Ques. 6] There is a current I flowing in a clockwise direction in a square loop of wire that is in the plane of the paper. If the magnetic field B is toward the right, and if each side of the loop has length L, then the net magnetic torque acting on the loop is
a.
2
ILB. b.
ILB. c.
IBL2.
d.
zero.
[Ques. 7] An object is thrown downward with an initial (t = 0) speed of 10 m/s from a height of 60 m above the ground. At the same instant (t = 0), a second object is propelled vertically upward from ground level with a speed of 40 m/s. At what height above the ground will the two objects pass each other?
a. 53 m
b. 41 m
c. 57 m
d. 46 m
e. 37 m
[Ques. 8] There is a current I flowing in a clockwise direction in a square loop of wire that is in the plane of the paper. If the magnetic field B is toward the right, and if each side of the loop has length L, then the net magnetic force acting on the loop is
a.
2
ILB. b.
ILB. c.
IBL2.
d.
zero.
[Ques. 9] A stone is thrown from the top of a building with an initial velocity of 20 m/s downward. The top of the building is 60 m above the ground. How much time elapses between the instant of release and the instant of impact with the ground?
a. 2.0 s
b. 6.1 s
c. 3.5 s
d. 1.6 s
e. 1.0 s
[Ques. 10] A wire is lying horizontally in the north-south direction and the horizontal magnetic field is toward the east. Some positive charges in the wire move north and an equal number of negative charges move south. The direction of the force on the wire will be:
a.
east.
b.
down, into the page.
c.
up, out of the page.
d.
There is no magnetic force.
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