Physics 105| Final Exam

Pregunta 1 de 10

10

A person travels south at a constant speed of 3 m/s in a straight line from town A to town B. Then he goes back at a constant speed of 7m/s from town B to town A in a straight line. Find the average speed in m/s during the entire trip.

Selecciona una de las siguientes respuestas posibles:

2.71 m/s
5.09 m/s
1.53 m/s
2.24 m/s
4.20 m/s

Explicación

Pregunta 2 de 10

10

A 3.0 kg box slides down a 20.0-degree incline with an initial speed of 4.5 m/s. The coefficient of kinetic friction between the box and the incline is 0.55. What is the acceleration of the block ( in m/s^2 )?

Selecciona una de las siguientes respuestas posibles:

1.71 down
1.71 up
0
3.35 up
3.35 down

Explicación

Pregunta 3 de 10

10

If Two objects M1, M2 (M1=M2 ) are connected by a light inextensible cord which is attached to the ceiling of an elevator that is accelerating upward at 2 m/s^2, the ration T/N is:

Selecciona una de las siguientes respuestas posibles:

5/3
2
1
3/2
1/2

Explicación

Pregunta 4 de 10

10

With a 307 J of kinetic energy, a 2 kg ball starts sliding up a rough ramp with an inclination of 30°. How far (in m) will the ball slide up the ramp knowing that the coefficient of kinetic friction between it and the ramp is 0.4?

Selecciona una de las siguientes respuestas posibles:

18.5
0.8
3.2
10.2
1.2

Explicación

Pregunta 5 de 10

10

A traffic light hangs from a pole as shown in the figure. The uniform aluminum pole AB is 7.2 m long and has a mass of 6.0 kg. The mass of the traffic light is 21.5 kg. Find the tension in the horizontal massless cable CD?

Selecciona una de las siguientes respuestas posibles:

608 N
363 N
570 N
370 N
408 N

Explicación

Pregunta 6 de 10

10

A rectangular block of mass m is placed in a fluid and acted upon by a force F such that the block is fully submerged and hangs in static equilibrium. If the density of the block is twice that of the fluid, the magnitude of the force F is:

Selecciona una de las siguientes respuestas posibles:

mg
mg/2
3mg
2mg
zero

Explicación

Pregunta 7 de 10

10

Consider that your average blood pressure is (1.33 N/cm^2 ) and your blood flow rate is (105 cm^3/s ). The energy your heart does provide in one day is used to lift a 72 kg box vertically to a height of h. Calculate the height h (in m).

Selecciona una de las siguientes respuestas posibles:

308
3
12
94
171

Explicación

Pregunta 8 de 10

10

At t=0, the activity of sample Q is 8 mCi and that of sample W is 2 mCi. After 13 weeks, the two samples have the same activity of 0.25 mCi. The ratio of the mean lifetime of W to the mean lifetime of Q is?
(Recall that 1 Ci=(3.7*10^10 Bq ).

Selecciona una de las siguientes respuestas posibles:

3/4
3/2
5/3
5/4
2/3

Explicación

Pregunta 9 de 10

10

The radioactive Iodine -131, which has a half-life of 8.02 days, is used for the diagnosis of the Thyroid gland. A patient was administered 10 micrograms of radioactive Iodine -131. After 3 days, the amount (in micrograms) remaining in his body is approximate: (Recall that ( 1 Ci=3.710^10 Bq, NA=6.0210^23 ).

Selecciona una de las siguientes respuestas posibles:

8.1
7.7
4.4
9.2
6.8

Explicación

Pregunta 10 de 10

10

Two radioactive samples A and B with half-lives TA and TB=2TA. Assuming the initial numbers of both samples are equal, which of the following statements is correct?

Selecciona una de las siguientes respuestas posibles:

Sample A decays faster than sample B.
The initial activities of A and B are the same.
Sample A decays slower than sample B.
λB = 2λA
None of the statements is correct.

	Creado por Fuad abualhaj hace alrededor de 3 años

Test sobre Physics 105| Final Exam, creado por Fuad abualhaj el 12/09/2021.

Physics 105| Final Exam

Pregunta 1 de 10

A person travels south at a constant speed of 3 m/s in a straight line from town A to town B. Then he goes back at a constant speed of 7m/s from town B to town A in a straight line. Find the average speed in m/s during the entire trip.

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 2 de 10

A 3.0 kg box slides down a 20.0-degree incline with an initial speed of 4.5 m/s. The coefficient of kinetic friction between the box and the incline is 0.55. What is the acceleration of the block ( in m/s^2 )?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 3 de 10

If Two objects M1, M2 (M1=M2 ) are connected by a light inextensible cord which is attached to the ceiling of an elevator that is accelerating upward at 2 m/s^2, the ration T/N is:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 4 de 10

With a 307 J of kinetic energy, a 2 kg ball starts sliding up a rough ramp with an inclination of 30°. How far (in m) will the ball slide up the ramp knowing that the coefficient of kinetic friction between it and the ramp is 0.4?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 5 de 10

A traffic light hangs from a pole as shown in the figure. The uniform aluminum pole AB is 7.2 m long and has a mass of 6.0 kg. The mass of the traffic light is 21.5 kg. Find the tension in the horizontal massless cable CD?

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 6 de 10

A rectangular block of mass m is placed in a fluid and acted upon by a force F such that the block is fully submerged and hangs in static equilibrium. If the density of the block is twice that of the fluid, the magnitude of the force F is:

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 7 de 10

Consider that your average blood pressure is (1.33 N/cm^2 ) and your blood flow rate is (105 cm^3/s ). The energy your heart does provide in one day is used to lift a 72 kg box vertically to a height of h. Calculate the height h (in m).

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 8 de 10

At t=0, the activity of sample Q is 8 mCi and that of sample W is 2 mCi. After 13 weeks, the two samples have the same activity of 0.25 mCi. The ratio of the mean lifetime of W to the mean lifetime of Q is? (Recall that 1 Ci=(3.7*10^10 Bq ).

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 9 de 10

Selecciona una de las siguientes respuestas posibles:

Explicación

Pregunta 10 de 10

Two radioactive samples A and B with half-lives TA and TB=2TA. Assuming the initial numbers of both samples are equal, which of the following statements is correct?

Selecciona una de las siguientes respuestas posibles:

Explicación

At t=0, the activity of sample Q is 8 mCi and that of sample W is 2 mCi. After 13 weeks, the two samples have the same activity of 0.25 mCi. The ratio of the mean lifetime of W to the mean lifetime of Q is?
(Recall that 1 Ci=(3.7*10^10 Bq ).