True or false a solid object can cast a shadow

Physics

2 answers:

nordsb [41]3 years ago

8 0

Yes, it is possible.

elena55 [62]3 years ago

7 0

That would be true because a solid object can cast a shadow

You might be interested in

How do contact and non-contact forces affect the design of different modes of transportation?

padilas [110]

Contact and non contact forces are big factors to consider in designing of different modes of transportation because this factors are resistances for the mode of transportation. These contact and non- contact forces should be minimized in order for the energy requirement to be also minimum. But not the extent of risking the safety, for example a non contact force is the wieght, the should be optimum, safety of the design should not be compromised just to reduce weight, just like by removing essential parts, support just to remove weight is not good.

7 0

4 years ago

A roller coaster has a vertical loop with radius 25.7 m. With what minimum speed should the roller-coaster car be moving at the

gogolik [260]

Answer:

15.88m/s

Explanation:

At the top of the roller coaster you will have three forces acting on the roller-coaster. See the image below. Fc is the centripetal force (for an object in circular motion), Fg is the gravitational force, and Fn is the normal force. To achieve the minimum speed we assume the roller-coaster is barely touching the vertical loop and so the normal force is zero. This leaves two acting forces.

$F_g = F_c\\mg = \frac{m\times v^2}{r}\\v = \sqrt{gr} = \sqrt{9.81 \times 25.7} = 15.88 m/s$

7 0

3 years ago

A disk-shaped platform has a known rotational inertia. The platform is mounted on a fixed axle and rotates in a horizontal plane

Nataly [62]

The frictional torque exerted on the platform by the axle as the platform rotates will be;

$\rm T_f \theta =\frac{1}{2} I [\omega^2-\omega_0^2]$

<h3>What is torque?</h3>

Torque is the force's twisting action about the axis of rotation. Torque is the term used to describe the instant of force. It is the rotational equivalent of force. Torque is a force that acts in a turn or twist.

The amount of torque is equal to force multiplied by the perpendicular distance between the point of application of force and the axis of rotation.

Work done by the frictional torque = Change in the rotational kinetic energy of the wheel

$\rm T_f \theta =\frac{1}{2} I [\omega^2-\omega_0^2]$

Where,

$\rm T_f$ is the frictional torque