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Kinematics

Kinematics is the study of how a body moves. This includes linear motion, angular motion, and rotational motion.

3,459 Questions

How many joules of kinetic energy does a 750 automobile traveling at a typical highway speed of 65 have?

750 kilograms? Sounds more resolvable than 750 lbs! So, I wull go with kg and convert 65 mph to meters per second.

65 mi/h (1609 meter/1 mile)(1 hour/3600 seconds)

= 29.1 meters per second

==========================now,

Kinetic Energy = 1/2mass(kg)*(m/s)2

KE = 1/2(750 kg)(29.1 m/s)2

= 3.2 X 105 Joules

=============

What is the kinetic energy of a 30 gram bullet that is traveling at 200 m s?

Kinetic energy = 0.5.m.v2

unit m = mass [=] kg

v = velocity [=] m/s

Gryazev-Shipunov GSh-30-2 firing 30 × 165mm bullet, bullet mass is 0.4 kg with velocity of 880 m/s

Help your self press the calculator for the kinetic energy.

Unit calculate is in Joules

An object is dropped from a height of 120.0 m It's velocity upon hitting the ground is?

The velocity of the object when it hits the ground can be found using the equation v = sqrt(2 * g * h), where v is the velocity, g is the acceleration due to gravity (9.8 m/s^2), and h is the height (120.0 m). Plugging in the values, we get v = sqrt(2 * 9.8 * 120) = 48.99 m/s. So, the velocity upon hitting the ground is 48.99 m/s.

Why Kinetic Friction is constant?

Because kinetic friction is proportional to the weight of the object moving, not the speed of the object. While it definitely seems like something that moves faster should be losing more energy to friction, friction only depends on how much the two objects push against each other, not how fast they touch. Imagine what would happen if hockey players slowed down due to increasing friction as they skated faster.

**Don't confuse pressure with the force of friction.**

Pressure = Force/Area

f = u*N (N is the normal force from the surface)

How fast do you blink mph?

I did my best to time my own blinks and estimated it takes around 60ms to close my eyelid, which is an estimated 1cm. Therefore I could close my eye 16.7 times in a second if I didn't have to change direction to reopen. That translates to 1000 times a minute, 60,000 times an hour -- or 60,000 cm an hour.

This shocked me quite a bit. 0.6km/h seems pretty darn slow.

Since you asked the question in MPH, 0.6km = 0.372823 miles.

How long does it take drive 1200 miles at 55 mph?

It takes approx 21 hours 49 minutes and 5 seconds.

Why is time an independent variable in a position vs time graph?

Because usually position is a function of time rather than the other way around. Changes in time result in changes in location. Changes in location do not cause changes in time.

How is a change in motion described?

In linear or axial motion, a change in speed, a deceleration or an acceleration.

Is number of moles vector or scalar?

There is no direction in number of moles, so it is scalar.

As a rocket rises its kinetic energy changes. At the time the rocket reaches its highest point most of the kinetic energy of the rocket has been and mdash?

When an object - rocket or otherwise - rises, its kinetic energy gets converted to gravitational potential energy. At its highest point, if it rises directly upwards, all the kinetic energy will be converted to gravitational potential energy. However, its movement may also have a sideways component; in that case, not all the kinetic energy is converted to potential energy.

How you calculate the kinetic energy of the particle projected vertically upwards?

The kinetic energy of a particle projected vertically upwards can be calculated using the formula: KE = 1/2 * m * v^2, where m is the mass of the particle and v is the velocity at which it is projected upwards. The kinetic energy is the energy associated with the motion of the particle.

Can you give me an example of an unbalanced force?

-- A tug-of-war with the football team on one end of the rope

and the cheerleaders on the other end.

-- The weight of the space shuttle and external fuel tanks vs.

the thrust of its rocket engines when they're all burning.

-- My weight in the water vs. the maximum upward force that

I'm able to generate by kicking.

-- The weight of the front bumper of a car, with the car attached,

vs. the maximum force with which a little old lady is able to lift it.

How fast is mach 500 in meters per second?

Mach 500 means 500 times the speed of sound. The speed of sound in air is somewhere around 350 meters/second. If you multiply that, you get approximately 175,000 meters/second, or 175 kilometers/second. Note that the speed of sound can vary, depending on several conditions.

Can an object with a constant acceleration reverse its direction of travel?

Of course. Anything you toss with your hand has constant acceleration after

you toss it ... the acceleration of gravity, directed downward.

If you toss it upward, it starts out with upward velocity, which reverses and

eventually becomes downward velocity.

How many miles per second is 17000 mph?

17,000 mph equates to 4.72 miles per second.

How much is 16 mph?

It means that in one hour, you will have travelled 16 miles.

How much is 110 miles per hour in kilometres per hour?

1 mile = 1.609344 km (exactly)

→ 110 miles per hour = 110 x 1.609344 km per hour

= 177.02784 km per hour

≈ 177 km/h

How many mph is 15 minutes in 20 minutes?

You haven't mentioned a distance to go with the speed so it cannot be answered. However, if you're given miles in 15 mins, multiply by 4 and if 20 mins, multiply by 3 to get them per hour

Is it wise for firm to employ a worker at 20 per hour when another worker does the same job for 10 per hour?

There may be many reasons for it - some good, some bad and some in between:

One of them is the owner's relative;

The higher paid worker is more skilled (or faster);

The two workers may be in different locations - with different employment rates and costs of living (that is the whole point of multinationals sourcing overseas!).

The firm may have to justify its decision to anti-discriminatory agencies.

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