Mechanics

Average acceleration is a net change in velocity over a corresponding change in time.

Your velocity went from 65 to 98 m/s - that's a positive change (gain) of 33 m/s.
the time interval was 12 s.

+ 33/12 m/s/s = + 2.75 m/s/s.

It really depends on the 8-year-old. You'd need to consider the kid's weight, level of physical activity, muscle mass, body fat percentage, extracurricular activities (sports can affect muscles), and many other factors.

velocity

You will have to learn a new terminology here: net force. Net force is the sum of all forces acting on an object. For example, in a tag of war, when one team is pulling the tag with a force of 100 N and the other with 80 N, the net force would be 20 N at the direction of the first team (100 N - 80 N = 20 N).

When forces are balanced, the net force is zero.

The handle of an egg beater is the axle, it turns a wheel, which in turn rotates the beaters.

First a force is a push or pull

The combination of all the forces acting on an object is the net force.

If your moving towards the same direction you add giving you the net force

---> + --->=net force

same direction

If you moving in different directions you subtract giving you the net force.

<---- - ---->

different direction

large force move the object.

The torque which is produced during the starting of motor is simply called as starting torque.

equal

Not necessarily zero; it depends. For example two people on a sse saw at same weight and same distance from fulcrum is zero moment but there is force at fulcrum equal to twice their individual weight

February, 1851. More details are available from the wikipedia article about the Foucault pendulum.

Hydraulic systems are most commonly found in braking systems on cars but can also be found on heavy-duty equipment like for lifting the back tray of dump trucks or on bulldozers for moving the blade.

Assuming 500km/h, it is 310 miles per hour.

force

Potential energy as related to height. E=GM/r

Momentum...............................................E=1/2 mv2

Crumple zones are sections of the car designed to fold easily under pressure. This means that the damage done to the car will actually increase quite a lot.

The good news is that the damage as a result of a crash is dramatically reduced for both the passengers in the car and the object the car hits.

The design is to prioritise life over property.

increase venous return

Hooke's law was designed to determine the restoring force of a spring, given its spring constant and the displacement of the spring from its equilibrium position. The law is written as follows:

F = -kx;

in which "F" is the restoring force, "k" is the spring constant, and "x" is the spring's displacement.

If you are referring to initial velocity with vi, then

Vfinal = Vinitial + a*t, where a is a constant acceleration, and t is the time.

So you must know a t and Vfinal to find Vinitial

Cable

The centripetal force that keeps a body in a circular path around another body is called gravity. It is one of the four fundamental forces, the other three being the strong interaction, the electromagnetic force, and the weak interaction. Gravity is the weakest of the four in terms of force, but it is the strongest of the four in terms of distance.

What differentiates the two is the amount of energy transferred in the sound. This energy is measured in the log unit "decibels." The compression waves from the loud sound carry more energy.

''television display ''is one of the best still model for science fair.

Quite often, it looks like they do. If Superman suddenly starts moving, without pushing himself off... well, that wouldn't work in real life, no matter how strong he is.

As both marbles are free-falling under gravity both have the same acceleration, g or 9.81ms-2