Exam (elaborations)

PHYSICS EXAM Complete Questions and Answers A+ Graded

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Physics - General Relativity

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Physics - General Relativity

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Uploaded on November 3, 2024
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Type Exam (elaborations)
Contains Questions & answers

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Institution Physics - General Relativity
Course Physics - General Relativity

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PHYSICS EXAM
Complete Questions and Answers
A+ Graded
1. Two blocks of masses m and M are suspended as shown above by
strings of negligible mass. If a person holding the upper string
lowers the blocks so that they have a constant downward
acceleration a, the tension in the string at point P is - ANSWER ✔
M(g−a)

2. An object is released from rest near the surface of a planet. The
vertical position of the object as a function of time is shown in the
graph. All frictional forces are considered to be negligible. The
strength of the gravitational field is most nearly - ANSWER ✔ 6

3. Two students wish to determine the value of g, the acceleration due
to gravity at Earth's surface. The students have a collection of
blocks of different masses, a string of negligible mass, a pulley of
negligible mass, and a device for measuring acceleration. The
students attach two of the blocks to the ends of the string and pass
the string over the pulley so the blocks hang vertically on either
side. The blocks are then released from rest, and their acceleration
is measured. The students' data for one trial are shown below, with
m1 and m2 equal to the masses of the blocks. Considering the
gravitational forces acting on the blocks, do the data provide a
reasonable determination of the value of g, and what is a possible
justification for why or why not? - ANSWER ✔ No, because the
calculated value of g is too small, possibly due to an additional
force exerted on the blocks-string system.

4. A student builds the apparatus shown. One end of a light string is
attached to an object of mass m0, and the other end of the string is
passed through a tube and attached to a second object of mass M.

, The student holds on to the tube and swings the object of mass m0
in a horizontal circle while the object of mass M remains at a
constant height. The time it takes for the object of mass m0 to
travel around its circular path is T. Which of the following options
represents the essential measuring devices needed by the student to
collect the necessary data to experimentally determine the
gravitational field strength of the object of mass m0 due to Earth's
gravitational field? - ANSWER ✔ Mass balance, meterstick, and
timer

5. The horizontal wire shown on the right in the figure above will
break when the tension in it exceeds the value Tmax. What is the
maximum mass M that the hanging object can have without the
horizontal wire breaking? (Assume the wire on the left does not
break prior to the horizontal wire breaking.) - ANSWER ✔ t max
tan theta/g

6. An object is thrown upward with a speed of 20m/s near the surface
of a planet where the gravitational field strength is a constant
magnitude of 6N/kg. The vertical position versus time of the object
is shown in the graph. Is the object considered to be in free fall? -
ANSWER ✔ Yes, because the only force exerted on the object is
the force due to gravity from the planet.

7. Blocks A and B, of masses m and 2m, respectively, are connected
by a light string and pulled across a surface of negligible friction
with a constant force F1, as shown above. The acceleration of the
blocks is a. The force of the string pulling block B forward has
magnitude F2. Which of the following claims correctly describes
the relationship between the magnitude of the forces acting on the
blocks? - ANSWER ✔ F1 is greater than F2

8. An object is dropped near the surface of a planet such that the
gravitational field at the object's location is 8 Nkg. If the object is

, thrown upward at a speed of 20 ms, what is the position of the
object in relation to the position in which the object was released
and thrown upward after 3s ? - ANSWER ✔ 24

9. A uniform spool is suspended from a vertical wall by a string
attached to the spool's thin axle. The axle is horizontal, as shown
above. The wall is smooth, so it exerts no frictional force on the
spool. The tension in the string is 2.6 N. What is the weight of the
spool? - ANSWER ✔ 2.4N

10. Planet 1 orbits Star 1 and Planet 2 orbits Star 2 in circular
orbits of the same radius. However, the orbital period of Planet 1 is
longer than the orbital period of Planet 2. What could explain this?
- ANSWER ✔ Star 1 has less mass than Star 2.

11. A person is running on a track. Which of the following forces
propels the runner forward? - ANSWER ✔ The force of friction
exerted by the ground on the person

12. A ball of mass M is on a horizontal surface with negligible
friction. One end of a string is attached to the ball so that it is spun
in a horizontal circle of radius R at tangential speed v0, as shown
in Figure 1. A free-body diagram for the ball at an instant in time is
shown in Figure 2. The magnitude of the tension force is also
indicated in Figure 2. Which of the following equations represents
the centripetal acceleration of the ball if its tangential speed is
increased to 2v0? - ANSWER ✔ ac=4vo^2/R

13. Students work together during an experiment about Newton's
laws. The students use a setup that consists of a cart of known
mass connected to one end of a string that is looped over a pulley
of negligible friction, with its other end connected to a hanging
mass. The cart is initially at rest on a horizontal surface and rolls
without slipping when released. The inertia of the cart's wheels is

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