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4 years ago

A force is described by its __________________ and by the direction in which it acts.

Physics

1 answer:

noname [10]4 years ago

8 0

A force is described by its MAGNITUDE and by the direction in which it acts

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The lantern rises up because the __________ of the _________inside the lantern is _________ compared to the air around it

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3 years ago

Read 2 more answers

A 240 N sphere 0.20 m in radius rolls, without slipping 6.0 m downa

Shalnov [3]

Answer:

The angular speed of the sphere at the bottom of the hill is 31.39 rad/s.

Explanation:

It is given that,

Weight of the sphere, W = 240 N

Radius of the sphere, r = 0.2 m

Angle with the horizontal, $\theta=28^{\circ}$

We need to find the angular speed of the sphere at the bottom of the hill if it starts from rest.

As per the law of conservation of energy, the total energy at the top is equal to the energy at the bottom.

Gravitational energy = translational energy + rotational energy

So,

$mgh=\dfrac{1}{2}mv^2+\dfrac{1}{2}I\omega^2$

I is the moment of inertia of the sphere, $I=\dfrac{2}{5}mr^2$

Also, $v=r\omega$

h is the height of the ramp, $h=l\ sin\theta$

$mgl\ sin\theta=\dfrac{1}{2}m(r\omega)^2+\dfrac{1}{2}I\omega^2$

On solving the above equation we get :

$\omega=\sqrt{\dfrac{10gl\ sin\theta}{7r^2}}$

$\omega=\sqrt{\dfrac{10\times 9.8\times 6\ sin(28)}{7(0.2)^2}}$

$\omega=31.39\ rad/s$

So, the angular speed of the sphere at the bottom of the hill is 31.39 rad/s. Hence, this is the required solution.

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3 years ago

When advertisers use well known, attractive people to sell their products, the attractive people are being used as a

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3 years ago

A negative test charge experiences a force to the right as a result of an electric field. What is the best conclusion to draw ba

sergiy2304 [10]

Answer:

The electric field points to the left because the force on a negative charge is opposite to the direction of the field.

Explanation:

Normally,in an electric field, the positive charge has tendency to move from higher to lower potential and therefore, experience the electric force in the direction of electric field since electric field lines are directed from high to low potential whike a negative charge has tendency to move from low to high potential and hence experience the electric force in the direction opposite to electric field since electric field lines are directed from high to low potential.

Thus, we can say that; The electric field points to the left because the force on a negative charge is opposite to the direction of the field.

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3 years ago

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