Physics Gravitation Level: Misc Level
Because Earth,s orbit is slightly elliptical, Earth actually gets closer to the Sun during part of the year. When Earth is closer to the Sun its orbital speed is;
a.Less than when Earth is farthest away from the Sun
b.The same as when Earth is farthest away from the Sun.
c.Greater than when Earth is farthest away from the Sun.
d. Sometimes greater sometimes smaller than when Earth is farthest away from the Sun.
Physics Gravitation Level: Misc Level
You are on an airplane traveling with a constant velocity at an altitude of20,000 m. What is the acceleration of gravity at that altitude?The radius of Earth is 6.37x10 to power of (6) m.
a. 9.81 m/s squared
b.9.78 m/s squared
c.9.75 m/s squared
d.9.72 m/s squared
Physics Gravitation Level: Misc Level
What would be the weight of a 59.1-kg astronaut on a planet with the same density as Earth and having twice Earth,s radius?
a.580 N
b.290N
c.1160 N
d.2320 N
Physics Gravitation Level: Misc Level
What would be the weight of a 59.1-kg astronaut on a planet twice as massive as Earth and having twice Earth,s radius?
a.580 N
b. 290 N
c. 1160 N
d.118 N
Physics Gravitation Level: Misc Level
An astronaut is in a capsule in a stable orbit, about two Earth radii from the center of Earth. Her weight is;
a. Zero N.
b.The same as on the surface of Earth.
c. About one-half of her weight on the surface of Earth.
d. About one-quarter of her weight on the surface of Earth.
Physics Rotational Mechanics Level: Misc Level
An ice skater doing a spin pulls in her arms, decreasing her moment of inertia by a factor of two. How does her angular speed changes?
a. It is reduced by a factor of two.
b. It is reduced by a factor of two.
c.It increases by a factor of two.
d. It increases by a factor of four.
Physics Rotational Mechanics Level: Misc Level
The torque required to turn the crank on an ice cream maker is 4.50 Nm . How much work does it take to tum the crank through 300 full turns?
a. 4240 J
b. 8480 J
c. 1350 J
d.2700 J
Physics Rotational Mechanics Level: Misc Level
A figure skater is spinning slowly with arms outstretched. She brings her arms in close to her boody and her moment of inertia decreases by 1/2. Her angular speed increases by a factor of;
a. 2.
b.4.
c.The square root of (2)
d. 1/2.
Physics Rotational Mechanics Level: Misc Level
A uniform meter stick with a mass of 135 g rotates about an axis perpendicular to the stick passing through the center of the stick with an angular speed of 3.50 rad/s squared. What is the magnitude of the angular momentum of the stick?
a.0.0394 k x m squared/s.
b.0.473 k x m squared/s.
c. 0.158 k x m squared/s.
d. 0.0236 k x m squared/s.
Physics Rotational Mechanics Level: Misc Level
A meter stick balances at the 50.0 -cm mark. If a mass of 50.0 g is placed at the 90.0-cm mark, the stick balances at the 61.3- cm mark. What is the mass of the meter stick?
a.127 g
b.178 g
c.32.6 g
d.73.4 g
Physics Rotational Mechanics Level: Misc Level
An 82.0 kg -diver stands at the edge of a light 5.00-m diving board, which is supported by two pillars 1.60 m apart.Find the force exerted by pillar B;
a. 1.71 kN downward B;
b.1.71 kN upwards.
c.2.51kN downwards.
d.2.51 kN upwards.
Physics Rotational Mechanics Level: Misc Level
A 320-g mass and a 400-g mass are attached to the two ends of a string that goes over a pulley with a radius of 8.70 cm. Because of friction, the pulley does not begin to rotate. What is the magnitude of the frictional torque on the bearing of the pulley if the system is in static equilibrium?
a.0.00683 Nm
b.0.614Nm
c.0.0626 Nm
d.0.000696 Nm
Physics Rotational Mechanics Level: Misc Level
When a car is weighed , it is allowed to move over a scale which records a reading as the frnt wheels go over the scale, and a second reading when the rear wheels go over the scale. The weight of the car is equal to;
a. The weight under the frnt wheels.
b. The weight under the rear wheels.
c.The average of the two weights.
d. The sum of the two weights.
Physics Rotational Mechanics Level: Misc Level
A man is holding an 8.00-kg vacuum cleaner at arm,s length, a distance of 0.550 m from his shoulder. What is the torque on the shoulder joint if the arm is horizontal?
a.4.40 Nm
b.43.2 Nm
c. 14.5 Nm
d. 0 Nm
Physics Waves And Oscillations Level: Misc Level
What are the resonant frequencies for an open organ opipe of fixed length L?
