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2022-09-26

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asked 2020-12-30

A majorette in a parade is performing some acrobatic twirlingsof her baton. Assume that the baton is a uniform rod of mass 0.120 kg and length 80.0 cm.

With a skillful move, the majorette changes the rotation ofher baton so that now it is spinning about an axis passing throughits end at the same angular velocity 3.00 rad/s as before. What is the new angularmomentum of the rod?

asked 2022-08-16

What can we tell about Torque from the equation τ = F R sinɸ, where F is the torquing force, R is the distance from the pivot point to where the force is applied, and ɸ is the angle between the two?

What can we tell about Torque from the equation τ = F R sinɸ, where F is the torquing force, R is the distance from the pivot point to where the force is applied, and ɸ is the angle between the two?

Select one:

a.

Torque is proportional to the force applied

b.

Torque depends on where the force is applied (the distance to the pivot point)c.Torque depends on the angle between the applied force vector and the vector pointing from the pivot point to where the force is applied

d. All of the above

Remembering that $\ell =R\mathrm{sin}\varphi $ and $\tau =F\ell $ if we are given a certain torquing force, 10 N, to act on a wheel of radius 2m, what is the maximum torque we can apply?

Select one:

a. $20N\cdot m$

b. $0N\cdot m$

c. $5N\cdot m$

d. $10N\cdot m$

For linear equilibrium, net force, $F=ma=0$, by newton's second law. What would Newton's Second Law for Rotations be for a system in rotational equilibrium? i.e. how can we express the net torque for a system with constant angular velocity? Let τ represent net torque, α represent angular velocity, I represent moment of inertia, and m and a represent mass and linear acceleration as usual.

Select one:

a. $\tau =ma=0$ because $m=0$

b. $\tau =I\alpha =0$ because $\alpha =0$

c. $\tau =ma=0$ because $a=0$

d. $\tau =I\alpha =0$ because $I=0$

The idea of the force multiplier in torque is sometimes referred to as leverage. There is a famous quote from Archimedes that goes, 'Give me a fixed point and a lever long enough and I shall move the world.' How can we understand this in terms of leverage?

Select one:

a. Long levers are not useful

b. Long levers can generate large forces

c. Leverage doesn't matter when torquing forces are applied

d. Leverage has little read-world application

How does Conservation of Angular Momentum help to produce seasons on Earth?

Select one:a. Conservation of Angular Momentum results in the Earth orbiting closer to the Sun in the Summer

b. The Earth’s rotational axis points in the same direction in space throughout its orbit around the Sun due to Conservation of Angular Momentum

c. The Earth’s rotational axis points in a different direction each 6 months due to Conservation of Angular Momentum

d. Conservation of Angular Momentum results in the Earth's rotational axis always pointing towards the Sun

What can we tell about Torque from the equation τ = F R sinɸ, where F is the torquing force, R is the distance from the pivot point to where the force is applied, and ɸ is the angle between the two?

Select one:

a.

Torque is proportional to the force applied

b.

Torque depends on where the force is applied (the distance to the pivot point)c.Torque depends on the angle between the applied force vector and the vector pointing from the pivot point to where the force is applied

d. All of the above

Remembering that $\ell =R\mathrm{sin}\varphi $ and $\tau =F\ell $ if we are given a certain torquing force, 10 N, to act on a wheel of radius 2m, what is the maximum torque we can apply?

Select one:

a. $20N\cdot m$

b. $0N\cdot m$

c. $5N\cdot m$

d. $10N\cdot m$

For linear equilibrium, net force, $F=ma=0$, by newton's second law. What would Newton's Second Law for Rotations be for a system in rotational equilibrium? i.e. how can we express the net torque for a system with constant angular velocity? Let τ represent net torque, α represent angular velocity, I represent moment of inertia, and m and a represent mass and linear acceleration as usual.

Select one:

a. $\tau =ma=0$ because $m=0$

b. $\tau =I\alpha =0$ because $\alpha =0$

c. $\tau =ma=0$ because $a=0$

d. $\tau =I\alpha =0$ because $I=0$

The idea of the force multiplier in torque is sometimes referred to as leverage. There is a famous quote from Archimedes that goes, 'Give me a fixed point and a lever long enough and I shall move the world.' How can we understand this in terms of leverage?

Select one:

a. Long levers are not useful

b. Long levers can generate large forces

c. Leverage doesn't matter when torquing forces are applied

d. Leverage has little read-world application

How does Conservation of Angular Momentum help to produce seasons on Earth?

Select one:a. Conservation of Angular Momentum results in the Earth orbiting closer to the Sun in the Summer

b. The Earth’s rotational axis points in the same direction in space throughout its orbit around the Sun due to Conservation of Angular Momentum

c. The Earth’s rotational axis points in a different direction each 6 months due to Conservation of Angular Momentum

d. Conservation of Angular Momentum results in the Earth's rotational axis always pointing towards the Sun

asked 2022-11-23

Which of the following statements is correct regarding diffusion?

Diffusion takes place only in gases.

Movement of substances takes place from low concentration to high concentration.

Movement of substances takes place from high concentration to low concentration.

Diffusion takes place only in liquids

Diffusion takes place only in gases.

Movement of substances takes place from low concentration to high concentration.

Movement of substances takes place from high concentration to low concentration.

Diffusion takes place only in liquids

asked 2022-05-15

How many kilograms of waters are needed to obtain the 198.8 mol of deuterium, assuming that deiterium is 0.01500% of natural hydrogen?

asked 2022-11-24

The sun is 150,000,000 km from earth; its diameter is 1,400,000 km. A student uses a 4.6-cm-diameter lens with f = 10 cm to cast an image of the sun on a piece of paper. What is the diameter of the image on the paper?

asked 2021-01-13

An ice cube tray of negligible mass contains 0.315 kg of water at $17.7}^{\circ$. How much heat must be removed to cool the water to $0.0}^{\circ$ and freeze it?

asked 2022-10-08

I was thinking how fast would a rocket have to go to maintain in the in earth orbit? I was thinking of the ISS going 7000kph with rocket boosters every 6 months. What is the most efficient way to solve this?