Physics second exam 2

Pregunta 1 de 18

1

The adjacent figure shows a setup of three masses that are connected by three wires. The whole system is under static equilibrium. If m1 = 10 kg, m2 = 20 kg and m3 = 30 kg, The tension (T1) in the first wire (measured in Newtons) is:

Selecciona una de las siguientes respuestas posibles:

98
588
196
392
294

Explicación

Pregunta 2 de 18

1

The figure to the right shows a mass 15-kg at rest and hanging from a vertical rope which is also hanging from two ropes. The tension T (in N) in the vertical rope is:

Selecciona una de las siguientes respuestas posibles:

15
147
127
0
50

Explicación

Pregunta 3 de 18

1

Three equal mass blocks each of mass m = 2 kg can move together over a horizontal frictionless surface. Two forces F1 = 40 N and F2 = 10 N are applied on the three masses system as shown in the figure the magnitude of the net force on the middle mass (in N) is:

Selecciona una de las siguientes respuestas posibles:

3.3
10
30
6.7
0

Explicación

Pregunta 4 de 18

1

A person stands on a scale in an elevator, The maximum and minimum scale reading are 591 N and 391 N respectively. If the acceleration of the elevator is constant , then the weight (N) of the person is:

Selecciona una de las siguientes respuestas posibles:

50
541
100
200
491

Explicación

Pregunta 5 de 18

1

In the figure mass m = 2 kg and the coefficients of static and kinetic friction are μs = 0.4, μk = 0.2 respectively. The acceleration (in m/s^2) of mass m is:

Selecciona una de las siguientes respuestas posibles:

0.64
0
9.8
1.3
2

Explicación

Pregunta 6 de 18

1

In the figure shown M = l0 kg and m = 4 kg. The coefficient of kinetic friction between the inclined surface and mass m is µk = 0.3. Given that the system started from rest, find the speed (in m/s) of mass M when it has fallen a distance of 2 m.

Selecciona una de las siguientes respuestas posibles:

2.96
3.6
4.42
3.96
2.1

Explicación

Pregunta 7 de 18

1

If the coefficient of kinetic friction (µk ) =0.2 , then the acceleration (in m/s^2 ) of the block is:

Selecciona una de las siguientes respuestas posibles:

13.2
1
3.33
0
10.8

Explicación

Pregunta 8 de 18

1

A small ball of mass is suspended from a string of length L The ball revolves with constant speed v in the horizontal circle of radius r as shown in the adjacent. if the string makes an angle θ with the vertical direction, the speed v of the ball is given by:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 9 de 18

1

A 750 Kg travels at 90 km/h around a curve with radius of 160 m. the banking an angle of the curve so that the car makes the turn successfully is:

Selecciona una de las siguientes respuestas posibles:

21.7 degree
9 degree
20.6 degree
25 degree
15 degree

Explicación

Pregunta 10 de 18

1

A 2-kg object is held stationary on a wall by a horizontal force F as shown. The static coefficient of friction between the object and the wall is 0.5. What is the minimum force required to hold the object from sliding down?

Selecciona una de las siguientes respuestas posibles:

39.2 N
23.5 N
9.8 N
49 N
19.6 N

Explicación

Pregunta 11 de 18

1

Power P is required to lift a body a distanced at a constant speed v. The power required to lift the body a distance 2d at constant speed 6v is: (ignore air resistance)

Selecciona una de las siguientes respuestas posibles:

P
2P
3P
6P
3P/2

Explicación

Pregunta 12 de 18

1

Two balls A and B of masses 2m and m, respectively are raised to the same height h and then back to the initial point, the total work done by the gravitational Force on B is:

Selecciona una de las siguientes respuestas posibles:

the same as the work done on A
one quarter the work done on A
one half the work done on A
Twice the work done on A
four times the work done on A

Explicación

Pregunta 13 de 18

1

A spring under a compression x has a potential energy U when the compression is doubled 2x the potential energy stored in the spring is ?

Selecciona una de las siguientes respuestas posibles:

U
2U
3U
4U
8U

Explicación

Pregunta 14 de 18

1

A small object of mass m starts at rest at the position shown and sides along the frictionless (loop –the-loop) track of radius R what is the smallest value of ( y ) such that the object will slide without contact with the track?

Selecciona una de las siguientes respuestas posibles:

R/2
R/4
R
2R
0

Explicación

Pregunta 15 de 18

1

A skier starts with an initial speed vi = 10 m/s at the bottom of a rough steady upward 30° inclined plane as shown. The skier travels a distance of 6 m along the plane before coming to rest. The value of the coefficient of kinetic friction is:

Selecciona una de las siguientes respuestas posibles:

0.17
1.55
0.7
0.4
0.91

Explicación

Pregunta 16 de 18

1

If the block shown slides from rest from point A and comes to complete stop against the spring at point B after moving 3 meters, then amount the spring has been compressed (in m) is:

Selecciona una de las siguientes respuestas posibles:

0.5
0.2
0.3
0.46
0.11

Explicación

Pregunta 17 de 18

1

Ball of mass 150 g is fired straight up with an initial velocity vi=10 m/s. It raised up, reached its maximum height and then came to the same initial position . the work in joules done on the ball by gravitational force through the entire trip is :

Selecciona una de las siguientes respuestas posibles:

20
8.3
2.41
1.94
Zero

Explicación

Pregunta 18 de 18

1

A particle of mass m=5 kg is released from rest at Point A and slides on the frictionless truck shown in the adjacent figure if hA = 15 m and hB = 4 m The practical’s speed in m/s at point B is :

Selecciona una de las siguientes respuestas posibles:

20
8.3
13.5
11.7
14.7

	Creado por Teresa stars hace más de 4 años

Test sobre Physics second exam 2 , creado por Teresa stars el 15/12/2019.

Physics second exam 2

Pregunta 1 de 18

The adjacent figure shows a setup of three masses that are connected by three wires. The whole system is under static equilibrium. If m1 = 10 kg, m2 = 20 kg and m3 = 30 kg, The tension (T1) in the first wire (measured in Newtons) is:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 2 de 18

The figure to the right shows a mass 15-kg at rest and hanging from a vertical rope which is also hanging from two ropes. The tension T (in N) in the vertical rope is:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 3 de 18

Three equal mass blocks each of mass m = 2 kg can move together over a horizontal frictionless surface. Two forces F1 = 40 N and F2 = 10 N are applied on the three masses system as shown in the figure the magnitude of the net force on the middle mass (in N) is:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 4 de 18

A person stands on a scale in an elevator, The maximum and minimum scale reading are 591 N and 391 N respectively. If the acceleration of the elevator is constant , then the weight (N) of the person is:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 5 de 18

In the figure mass m = 2 kg and the coefficients of static and kinetic friction are μs = 0.4, μk = 0.2 respectively. The acceleration (in m/s^2) of mass m is:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 6 de 18

In the figure shown M = l0 kg and m = 4 kg. The coefficient of kinetic friction between the inclined surface and mass m is µk = 0.3. Given that the system started from rest, find the speed (in m/s) of mass M when it has fallen a distance of 2 m.

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 7 de 18

If the coefficient of kinetic friction (µk ) =0.2 , then the acceleration (in m/s^2 ) of the block is:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 8 de 18

A small ball of mass is suspended from a string of length L The ball revolves with constant speed v in the horizontal circle of radius r as shown in the adjacent. if the string makes an angle θ with the vertical direction, the speed v of the ball is given by:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 9 de 18

A 750 Kg travels at 90 km/h around a curve with radius of 160 m. the banking an angle of the curve so that the car makes the turn successfully is:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 10 de 18

A 2-kg object is held stationary on a wall by a horizontal force F as shown. The static coefficient of friction between the object and the wall is 0.5. What is the minimum force required to hold the object from sliding down?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 11 de 18

Power P is required to lift a body a distanced at a constant speed v. The power required to lift the body a distance 2d at constant speed 6v is: (ignore air resistance)

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 12 de 18

Two balls A and B of masses 2m and m, respectively are raised to the same height h and then back to the initial point, the total work done by the gravitational Force on B is:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 13 de 18

A spring under a compression x has a potential energy U when the compression is doubled 2x the potential energy stored in the spring is ?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 14 de 18

A small object of mass m starts at rest at the position shown and sides along the frictionless (loop –the-loop) track of radius R what is the smallest value of ( y ) such that the object will slide without contact with the track?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 15 de 18

A skier starts with an initial speed vi = 10 m/s at the bottom of a rough steady upward 30° inclined plane as shown. The skier travels a distance of 6 m along the plane before coming to rest. The value of the coefficient of kinetic friction is:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 16 de 18

If the block shown slides from rest from point A and comes to complete stop against the spring at point B after moving 3 meters, then amount the spring has been compressed (in m) is:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 17 de 18

Ball of mass 150 g is fired straight up with an initial velocity vi=10 m/s. It raised up, reached its maximum height and then came to the same initial position . the work in joules done on the ball by gravitational force through the entire trip is :

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 18 de 18

A particle of mass m=5 kg is released from rest at Point A and slides on the frictionless truck shown in the adjacent figure if hA = 15 m and hB = 4 m The practical’s speed in m/s at point B is :

Selecciona una de las siguientes respuestas posibles:

Explicación