Pregunta 1
Pregunta
A projectile is fired horizontally in a region of no air resistance. The projectile maintains its horizontal component of velocity because
Respuesta
-
it is acted upon by any force
-
it is not acted upon by any horizontal force
-
it has no vertical component of velocity to begin with
-
none of these
Pregunta 2
Pregunta
A 100-N force vector, acting at an angle of 45 degrees to the horizontal, has
Respuesta
-
a greater magnitude of vertical component
-
a greater magnitude of horizontal component
-
the same magnitude of vertical and horizontal components
-
no vertical and horizontal components
Pregunta 3
Pregunta
A car travels 120 km east and then 50 km north. What distance should the car travel in order to return to its origin in a straight path?
Pregunta 4
Pregunta
At what angle should the car in preceding item head in order to return to its origin in a straight path?
Respuesta
-
22.60 north of east
-
22.60 south of west
-
67.40 north of east
-
67.40 south of west
Pregunta 5
Pregunta
What can be said when a net force acts on a body?
Respuesta
-
the body is at rest
-
the body is in uniform motion
-
the body has no acceleration
-
the body has a constant acceleration
Pregunta 6
Pregunta
What is the acceleration of a car that maintains a constant velocity of 60 km/h for 2 hrs
Respuesta
-
0
-
3600 km/ s2
-
60 km/s2
-
120 km / s2
Pregunta 7
Pregunta
A ball is thrown upward and caught when it comes back down. Neglecting air resistance, the speed with which the ball is caught is
Respuesta
-
less than the speed it had when thrown upward
-
more than the speed it had when thrown upward
-
the same speed it had when thrown upward
-
zero
Pregunta 8
Pregunta
A stone is thrown at an angle of 30 degrees above the horizontal. As it rises, its vertical component of velocity
Pregunta 9
Pregunta
If you drop an object, it will accelerate downward at a rate of 9.8 m/s2. If you instead throw it upward, its acceleration (in the absence of air resistance) will be
Pregunta 10
Pregunta
You stand at the top of a cliff and throw a rock downward, and another rock horizontally at the same speed. The rock that stays in the air for the longer time is the one thrown
Pregunta 11
Pregunta
Races are timed to 1/1000 of a second. What distance could skater moving at a speed of 10 m/s travel in that period of time?
Pregunta 12
Pregunta
A, B and C are coplanar, concurrent forces. If A= 100 dyn, 35o N of W; B= 150 dyn, 25o W of S; and A+B+C = 200 dyn, E:
1. What is the magnitude of C?
Respuesta
-
78.689 dyn
-
200 dyn
-
354.138 dyn
-
345.308 dyn
Pregunta 13
Pregunta
A, B and C are coplanar, concurrent forces. If A= 100 dyn, 35 degrees N of W; B= 150 dyn, 25 degrees W of S; and A+B+C = 200 dyn, E:
2. What is the direction of C?
Respuesta
-
12.822 degrees N of E
-
12.822 degrees S of W
-
77.178 degrees N of E
-
77.178 degrees S of W
Pregunta 14
Pregunta
A, B and C are coplanar, concurrent forces. If A= 100 dyn, 35 degrees N of W; B= 150 dyn, 25 degrees W of S; and A+B+C = 200 dyn, E:
3. What is the magnitude of A-B-2C?
Respuesta
-
-709.138 dyn
-
710.058 dyn
-
709.138 dyn
-
-710.058 dyn
Pregunta 15
Pregunta
A, B and C are coplanar, concurrent forces. If A= 100 dyn, 35 degrees N of W; B= 150 dyn, 25 degrees W of S; and A+B+C = 200 dyn, E:
4. What is the direction of A-B-2C?
Respuesta
-
87.0837 degrees S of E
-
87.08370 N of W
-
2.916 degrees S of E
-
2.916 degrees N of W
Pregunta 16
Pregunta
II. From the top of a 100-m cliff overlooking the sea, a physics student throws, stones A and B. The stones have identical initial speeds of Vo =13 m/s and are thrown at the same angle of θ = 30o, stone A above the horizontal and stone B below the horizontal. Neglecting air resistance:
5. What is the velocity of stone A just before it hits the lake?
Respuesta
-
46.139 m/s
-
44.744 m/s
-
11.258 m/s
-
12.354 m/s
Pregunta 17
Pregunta
II. From the top of a 100-m cliff overlooking the sea, a physics student throws, stones A and B. The stones have identical initial speeds of Vo =13 m/s and are thrown at the same angle of θ = 30o, stone A above the horizontal and stone B below the horizontal. Neglecting air resistance:
6. What is the velocity of stone B just before it hits the lake?
Respuesta
-
44.75 m/s
-
14.121 m/s
-
11.258 m/s
-
46.144 m/s
Pregunta 18
Pregunta
II. From the top of a 100-m cliff overlooking the sea, a physics student throws, stones A and B. The stones have identical initial speeds of Vo =13 m/s and are thrown at the same angle of θ = 30o, stone A above the horizontal and stone B below the horizontal. Neglecting air resistance:
7. What is the distance between the points where the stones hit the lake?
Respuesta
-
15.643 m
-
58.87 m
-
14.929 m
-
43.941 m
Pregunta 19
Pregunta
II. From the top of a 100-m cliff overlooking the sea, a physics student throws, stones A and B. The stones have identical initial speeds of Vo =13 m/s and are thrown at the same angle of θ = 30o, stone A above the horizontal and stone B below the horizontal. Neglecting air resistance:
8. How long after stone B hits the lake does stone A hit the lake?
Respuesta
-
5.229 sec
-
2.303 sec
-
1.326 sec
-
3.629 sec
Pregunta 20
Pregunta
III. A car and a truck start from rest at the same instant, with the car initially at some distance behind the truck. The truck has a constant acceleration of 3 ft/s2 while the car has a constant acceleration 4 ft/s2. The car overtakes the truck after the truck has moved 60ft.
9. How long did it take the car to overtake the truck?
Respuesta
-
6.325 sec
-
1.785 sec
-
8.110 sec
-
12 sec
Pregunta 21
Pregunta
III. A car and a truck start from rest at the same instant, with the car initially at some distance behind the truck. The truck has a constant acceleration of 3 ft/s2 while the car has a constant acceleration 4 ft/s2. The car overtakes the truck after the truck has moved 60ft.
10. How far was the car behind the truck initially?
Respuesta
-
80.011 m
-
20.011 m
-
80.011 ft
-
20.011 ft
Pregunta 22
Pregunta
III. A car and a truck start from rest at the same instant, with the car initially at some distance behind the truck. The truck has a constant acceleration of 3 ft/s2 while the car has a constant acceleration 4 ft/s2. The car overtakes the truck after the truck has moved 60ft.
11. What was the velocity of the car when they were abreast?
Respuesta
-
18.975 m/s
-
18.975 ft/s
-
25.3 m/s
-
25.3 ft/s
Pregunta 23
Pregunta
III. A car and a truck start from rest at the same instant, with the car initially at some distance behind the truck. The truck has a constant acceleration of 3 ft/s2 while the car has a constant acceleration 4 ft/s2. The car overtakes the truck after the truck has moved 60ft.
12. What was the velocity of the truck when they were abreast?
Respuesta
-
18.975 m/s
-
18.975 ft/s
-
25.3 m/s
-
25.3 ft/s
Pregunta 24
Pregunta
IV. The system shown is in equilibrium.
13. What is the tension T3 in cord 3?
Respuesta
-
1003.820 N
-
819.615 N
-
300 N
-
956.712 N
Pregunta 25
Pregunta
IV. The system shown is in equilibrium.
14. What is the tension T4 in cord 4?
Respuesta
-
163.3824 N
-
819.615 N
-
1005.407 N
-
926.5878 N
Pregunta 26
Pregunta
IV. The system shown is in equilibrium.
15. What is the tension T5 in cord 5?
Respuesta
-
1005.4066 N
-
163.3824 N
-
940.8819 N
-
819.34N
Pregunta 27
Pregunta
16. What is the weight of block B?
Respuesta
-
163.3824 N
-
819.615 N
-
1005.407 N
-
926.5878 N
Pregunta 28
Pregunta
V. In the figure below, the pulleys are light and frictionless, and the coefficients of friction between the blocks and the surfaces are μk = 0.10 and μs = 0.30. If the hanging block X moves down a distance of 0.5m in 0.5s starting from rest:
17. What is the constant acceleration of the system?
Pregunta 29
Pregunta
V. In the figure below, the pulleys are light and frictionless, and the coefficients of friction between the blocks and the surfaces are μk = 0.10 and μs = 0.30. If the hanging block X moves down a distance of 0.5m in 0.5s starting from rest:
18. What is the tension in the cord connecting the 40-kg block and the 10-kg block?
Respuesta
-
200 N
-
199.2 N
-
236.657 N
-
45.257 N
Pregunta 30
Pregunta
V. In the figure below, the pulleys are light and frictionless, and the coefficients of friction between the blocks and the surfaces are μk = 0.10 and μs = 0.30. If the hanging block X moves down a distance of 0.5m in 0.5s starting from rest:
19. What is the tension in the cord connecting the 10-kg block and the 20-kg block?
Respuesta
-
84.87 N
-
199.23 N
-
980 N
-
296.687 N
Pregunta 31
Pregunta
V. In the figure below, the pulleys are light and frictionless, and the coefficients of friction between the blocks and the surfaces are μk = 0.10 and μs = 0.30. If the hanging block X moves down a distance of 0.5m in 0.5s starting from rest:
20. What is the mass of the hanging block X?
Respuesta
-
68.325 kg
-
68.325 N
-
669.585 kg
-
669.585 N