Questão 1
Questão
A projectile is fired horizontally in a region of no air resistance. The projectile maintains its horizontal component of velocity because
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it is acted upon by any force
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it is not acted upon by any horizontal force
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it has no vertical component of velocity to begin with
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none of these
Questão 2
Questão
A 100-N force vector, acting at an angle of 45 degrees to the horizontal, has
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a greater magnitude of vertical component
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a greater magnitude of horizontal component
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the same magnitude of vertical and horizontal components
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no vertical and horizontal components
Questão 3
Questão
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?
Questão 4
Questão
At what angle should the car in preceding item head in order to return to its origin in a straight path?
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22.60 north of east
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22.60 south of west
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67.40 north of east
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67.40 south of west
Questão 5
Questão
What can be said when a net force acts on a body?
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the body is at rest
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the body is in uniform motion
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the body has no acceleration
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the body has a constant acceleration
Questão 6
Questão
What is the acceleration of a car that maintains a constant velocity of 60 km/h for 2 hrs
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0
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3600 km/ s2
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60 km/s2
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120 km / s2
Questão 7
Questão
A ball is thrown upward and caught when it comes back down. Neglecting air resistance, the speed with which the ball is caught is
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less than the speed it had when thrown upward
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more than the speed it had when thrown upward
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the same speed it had when thrown upward
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zero
Questão 8
Questão
A stone is thrown at an angle of 30 degrees above the horizontal. As it rises, its vertical component of velocity
Questão 9
Questão
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
Questão 10
Questão
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
Questão 11
Questão
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?
Questão 12
Questão
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?
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78.689 dyn
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200 dyn
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354.138 dyn
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345.308 dyn
Questão 13
Questão
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?
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12.822 degrees N of E
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12.822 degrees S of W
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77.178 degrees N of E
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77.178 degrees S of W
Questão 14
Questão
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?
Responda
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-709.138 dyn
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710.058 dyn
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709.138 dyn
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-710.058 dyn
Questão 15
Questão
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?
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87.0837 degrees S of E
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87.08370 N of W
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2.916 degrees S of E
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2.916 degrees N of W
Questão 16
Questão
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?
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46.139 m/s
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44.744 m/s
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11.258 m/s
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12.354 m/s
Questão 17
Questão
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?
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44.75 m/s
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14.121 m/s
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11.258 m/s
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46.144 m/s
Questão 18
Questão
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?
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15.643 m
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58.87 m
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14.929 m
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43.941 m
Questão 19
Questão
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?
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5.229 sec
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2.303 sec
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1.326 sec
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3.629 sec
Questão 20
Questão
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?
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6.325 sec
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1.785 sec
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8.110 sec
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12 sec
Questão 21
Questão
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?
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80.011 m
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20.011 m
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80.011 ft
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20.011 ft
Questão 22
Questão
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?
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18.975 m/s
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18.975 ft/s
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25.3 m/s
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25.3 ft/s
Questão 23
Questão
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?
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18.975 m/s
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18.975 ft/s
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25.3 m/s
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25.3 ft/s
Questão 24
Questão
IV. The system shown is in equilibrium.
13. What is the tension T3 in cord 3?
Responda
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1003.820 N
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819.615 N
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300 N
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956.712 N
Questão 25
Questão
IV. The system shown is in equilibrium.
14. What is the tension T4 in cord 4?
Responda
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163.3824 N
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819.615 N
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1005.407 N
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926.5878 N
Questão 26
Questão
IV. The system shown is in equilibrium.
15. What is the tension T5 in cord 5?
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1005.4066 N
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163.3824 N
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940.8819 N
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819.34N
Questão 27
Questão
16. What is the weight of block B?
Responda
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163.3824 N
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819.615 N
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1005.407 N
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926.5878 N
Questão 28
Questão
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?
Questão 29
Questão
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?
Responda
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200 N
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199.2 N
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236.657 N
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45.257 N
Questão 30
Questão
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?
Responda
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84.87 N
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199.23 N
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980 N
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296.687 N
Questão 31
Questão
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?
Responda
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68.325 kg
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68.325 N
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669.585 kg
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669.585 N