physics final semester 2

a

Three cars (car F, car G, and car H) are moving with the same speed and slam on their brakes. the most massice car is car F, and the least massive is car H. if the tires of all three cars have identical coefficients of kinetic friction with the road surface, which car travels the longest distance to skid to a stop? a-they all travel the same distance in stopping b-car F c-Car G d-Car H

B

Three equal charges +Q are at three of the corners of a square of side d. a fourth charge +Q of equal magnitude is at the center of the square as shown in the figure which one of the arrows shown represents the net force acting on the charge at the center of the square. a-A b-B c-C d-D

b

a 0.330-kg volleyball is thrown vertically downward with a speed of 0.150 m/s in a place where g= 9.81 m/s^2. it takes it 0.0655 s to reach the ground .what is the magnitude of its momentum just before it hits the ground? a- 0.212 kg * m/s b- 0.262 kg * m/s c- 0.163 kg *m/s d- 0.02160.0216 kg * m/s e- 0.0418 kg * m/s

e

a 1000-kg whale swims horizontally to the right at a speed of 6.0 m/s. suddenly collides directly with a stationary seal of mass 200 kg. the seal grabs onto the whale and holds fast. what is the momentum of these two sea creatures just after their collision? you can neglect any drag efforts of the water during the collision? a-0.00 kg * m/s b-1200 kg * m/s c-2000 kg *m/s d-7200 kg * m/s e-6000 kg * m/s

a

a 1200-kg cannon suddenly fires a 100-kg cannonball at 35 m/s. what is the recoil speed of the cannon? assume that frictional forces are negligible and the cannon is fired horizontally. a-2.9 m/s b-3.5 m/s c-3.5 m/s d-3.2 m/s

a

a 1200-kg ore cart is rolling at 10.8 m/s across a flat friction-free surface. a crane suddenly drops 858 kg of ore vertically into the cart. how fast does the cart move just after being loaded with the ore? a-6.30 m/s b-3.80 m/s c-4.20 m/s d-5.70 m/s

c

a beam of light that is parallel to the principal axis strikes a convex mirror. what happens to the reflected beam of light a-it also is parallel to the principal axis b-it is perpendicular to the principal axis c-it appears to be coming from the focal point on the other side of the mirror d-it appears to be coming from the center of the curvature of the mirror e-it appears to be coming from a point between the focal point and the center of curvature of the mirror

d

a beam of light traveling in air strikes a glass slab at an angle of incidence less that 90 degrees. after entering the glass slab, what does the beam of light do? a-it follows the same path as before it struck the glass b-it follows the normal line c-it bends away from the normal d-it bends closer to the normal e-it speeds up

a

a block of mass m=3.6 kg moving on a friction-less surface with a speed vi= 9.3 m/s makes a sudden perfectly elastic collision with a stationary block of mass M, as shown in the figure. just after the collision, the 3.6-kg block recoils with a speed of vf=2.7 m/s. what is the speed V of the other other block? a-6.6 m/s b-8.0 m/s c-9.3 m/s d-10.7 m/s e-12.0 m/s

a

a child does 350 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. the tree house is 4.0 m above the ground. what is the mass of the box? a-8.9 kg b-5.3 kg c-6.7 kg d-8.0 kg

a

a child pulls on a wagon with a force of 75 N. if the wagon moves a total of 42 m in 3.1 min, what is the average power delivered by the the child? a-17 W b-21 W c-22 W d-26 W

c

a convex lens has focal length f. if an object is located at "infinity" (Very far away), the image formed is located at a distance from the lens a-of 2f b-between f and 2f c-of F d-between the lens and f e-of infinity

c

a golf club exerts an average horizontal force of 1000 N on a 0.045-kg golf ball that is initially at rest on the tee. the club is in contact with the ball for 1.8 ms. what is the speed of the golf ball just as it leaves the tee? a-30 m/s b- 35 m/s c-40 m/s d- 45 m/s e- 50 m/s

b

a laser beam strikes a plane mirrors reflecting surface with an angle of incidence of 43 degrees. what is the angle between the incident ray and reflected ray a-43 b-86 c-45 d-90 e-0

a

a piece of plastic has a net charge of +2.00 uC. how many more protons than electrons does this piece of plastic have? (e = 1.60 x 10^-19) a- 1.25 x 10^13 b- 1.25 x 10^19 c- 2.50 x 10 ^ 13 d- 2.50 x 10 ^19 e- 3.01 x 10 ^23

d

a stone can slide down one of four different friction-less ramps, as shown in the figure. For which ramp will the speed of the ball be the greatest at the bottom? a-ramp X b-ramp Y c-ramp Z d-the speed of the ball will be the same for all ramps

d

a stone is held at a height h above the ground. a second stone with four times the mass of the first one is held at the same height. the gravitational potential energy of the second stone compared to that of the first stone is a-one-fourth as much b-one-half as much c-twice as much d-four times as much e-the same

a

a truck has four times the mass of a car and is moving with twice the speed of the car. if K truck and K car are the kinetic energies, then it is correct to say that a-Ktruck = 16Kcar b-Ktruck= 4Kcar c-Ktruck= 2Kcar d-Ktruck= Kcar e-Ktruck= 1/2Kcar

a

an asteroid of mass 58,000 kg carrying a negative charge of 15 uC is 180 m from a second asteroid of mass 52,000 kg carrying a negative charge of 11 uC what is the magnitude of the net force the asteroids exert upone each other, assuming we can treat them as point particles? a- 0.000040 N b- 0.0062 N c- 570,000 N d- 510,000 N

d

an electron is initially moving to the right when it enters a uniform electric field directed upwards, as shown in the figure. which trajectory ( X, Y, X, or W) will the electron follow in the field a- trajectory W b- trajectory X c- trajectory Y d- trajectory Z

b

an oil layer that is 5.0 cm thick spread smoothly and evenly over the surface of water on a windless day. a light ray from the air above enters the oil at 45 degrees with the normal and then goes into the water. what is the angle of refraction of this ray in the water? the index of refraction for the oil is 1.15 and for water it is 1.33 a-27 b-32 c-36 d-39

a

draw a circuit with a battery connected to four resistors, R1, R2, R3, R4, as follows. resistors R1 and R2 are connected in parallel with each other, resistors R3 and R4 are connected in parallel with each other, and both parallel sets of resistors are connected in series with each other across the battery a-on left and right b- all to left r3 top right c- all to left r2 top right d- top and bottom

a

for the graph shown in the figure, what physical quantity does the slope of the graph represent for ohmic material a- current b- resistivity c- 1/(Current) d- power e- 1/(resistivity)

a

four point charge of varying magnitude and sign are arranged on the corners of the square of side d as shown in the figure. which one of the arrows shown represents the net force acting on the point charge with a charge +Q a- a b- B c- C d- D

a

four unequal resistors are connected in a parallel with each other. which one of the following statements is correct about this combination a-the equivalent resistance is less than that of the smallest resistor b-the equivalent resistance is equal to the average of the four resistances c-the equivalent resistance is midway between the largest and smallest resistance d-non of the other choices is correct

c

how much charge must pass by a point in a wire in 10 s for the current inb the wire to be 0.50 A a- 20 C b- 2.0 C c- 5.0 C d- 0.050 C

c

identical ideal batteries are connected in different arrangements to the same light bulb, as shown in the figure. for which arrangement will the bulb shine the brightest a-on battery b- 2 battieres zig zag c- 2 batteries equal

a

if an object is placed between a convex lens and its focal point, the image formed is a-virtual and upright b-virtual and inverted c-real and upright d-real and inverted

c

if the force of an object is in the negative direction, the work it does on the object must be a-negative b-positive c-the work could be either positive or negative, depending on the direction the object moves

c

if the resistance in a constant voltage circuit is doubled, the power dissipated by that circuit will a-increase by a factor of two b-increase by a factor of four c-decrease to one-half its original value d-decrease to one-fourth its original value

a

is it possible to see a virtual image by projecting it onto a screen a-no, a virtual image is only seen within the brain b-no, since virtual images do not really exist c-yes because the rays that appear to come from a virtual image can be focused by the eye just like those from an object d-yes, but only by using an additional lens to form a real image before the light reaches the eye

b

the figure shows a famous roller coaster ride. you can ignore friction. if the roller coaster leaves point Q from rest, what is its speed at the top of the 25-m peak (point S) a-10 m/s b-22 m/s c-44 m/s d-62 m/s e-120 m/s

a

three equal-magnitude point charges of varying signs are placed at the corners of a square of side d as shown in the figure. which one of the arrows shown represents the direction of the net electric field at the center of the square a-A b-B c-C d-D

d

three objects are moving along a straight line as shown in the figure. taking the positive direction to be to the right, what is the total momentum of this system? a- +106 kg * m/s b- -106 kg * m/s c- +14.0 kg * m/s d- -14.0 kg * m/s e- 0.00 kg * m/s

d

three resistors with resistance of 2.0, 6.0, and 12 are connected across an ideal dc voltage source V as shown in the figure. if the total current through the circuit is I=2.0 A, what is the applied voltage V a-6.0 V b-3.0 V c-2.0 V d-2.7 V e-1.5 V

e

two point charges, Q1 and Q2 are separated by a distance R. if the magnitudes of both charges are halved and their separation is also halved, what happens to the electrical force that each charge exerts on the other one? a- it increases by a factor of 16 b- it increases by a factor of 8 c- it increases by a factor of 2 d- it increases by a factor of 4 e- it remains the same

c

two tiny beads are 25 cm apart with not other charges or fields present. Bead A carries 10 uC of charge and bead B carries uC (u= 1x10^-6) which one of the following statements is true about the magnitude of the electric forces on these beads? a- the force on A is 10 times the force on B b- the force on B is 10 times the force on A c- the force on A is exactly equal to the force on B d- the force on A is 100 times the force on B e- the force on B is 100 times the force on A

b

what is the resistance of a 100 W light bulb designed to be used in a 120- V circuit dc a- 12.0 b- 144 c- 1.2 d- 0.83

b

what is the voltage drop across a 5.0 resistor if the current through it is 5.0 A a- 100 V b- 25 V c- 4.0 V d- 1.0 V

b

you are standing on a skateboard, initially at rest. a friend throws a very heavy ball towards you. you have two choices about what to do with the ball: either catch the ball or deflect it back toward your friend with the same speed as it was originally thrown. which choice should you make in order to maximize your speed on the skateboard? a-catch the ball b-deflect the ball back c-your final speed on the skateboard will be the same regardless whether you catch the ball of deflect the ball