Kinematics

It will take 7 hours and 20 minutes.

1 mile = 5280 ft

1 hour = 3600 seconds

45mph = 45 x 5280 / 3600 ft/s

=66ft/s

420ft / 66ft/s ~= 6.36 seconds

Speed = Distance in kilometers/Time in hours

I work that out as 4.87 seconds.

When an object is lifted to a certain height, the mechanical energy of the person or system lifting the object gets transferred into the potential energy of the object. Thus if an object of mass/weight 'm' is lifted to a height 'h', then the potential energy possed by the object at height 'h' is given as: Potential Energy (P.E)= m*g*h, where g is acceleration due to gravity and whose value is 9.8 m/s2.

77.73 feet every second.

At 25 miles per hour, a car travels: 36.67 feet per second.

No, the fly's speed is relative to the space it is in, the air it is flying in is moving with the car, but static inside. It would, however, be different if the windows were open. The same would apply to environments like inside of an airplane or a train. Also, the earth travels trough space at over 17,000 kilometers per hour, when you are walking down the street, you aren't walking that fast.

I would say about $12 an hour per person for normal yard work. Anythig out of the ordinary should raise this price.

To calculate how many mph a motorist will travel 11 feet before braking at a certain speed, you can use the formula distance = 1/2 * acceleration * time^2. By solving for time and converting it to seconds, you can calculate the speed in mph. This calculation will vary depending on the specific acceleration of the vehicle.

the reason that ants move faster then elephants is because there is less friction between their feel and the ground meaning that they can move them faster and with less difficulty. this is also because they are lighter in weight!

We set the potential energy formula, PE = mgh, equal to the kinetic energy formula, KE = 1/2mV^2

mgh = 1/2mV^2

cancel m algebraically

gh = 1/2V^2

plug and chug

(9.80 m/s^2)h = 1/2(20 m/s)^2

9.80h = 200

height = 20.4 meters

The net force on a capacitor in a circuit is zero because the electrical forces acting on the capacitor plates are equal in magnitude and opposite in direction, leading to a balanced system. This is due to the fact that the charges on the plates create an electric field that exerts forces that cancel each other out.

Mass and velocity. Look at the expression KE = 1/2 m v^2

If you want me to pick out the correct item from a list of multiple choices,

the least you could do would be to let me see the list.

In this case, even if you only gave me the expression for the velocity, I could

integrate it.

Here, you're asking me to point to the correct answer, without letting me see

the question or the choices. Much appreciated, I'm sure.

Not necessarily. The graph of instantaneous velocity versus time may or may not have a Y-axis intercept of zero. It depends on the initial conditions and motion of the object. If the object starts from rest, then the initial velocity is zero, and the graph will have a Y-axis intercept at zero.

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

KE = 1/2mV^2

KE =1/2(2500 kg)(35 m/s)^2

= 1531250 Joules

better expressed as

1.5 X 10^6 Joules

A falling rock. In the air it has potential energy, as it falls it gets kinetic energy.

Just use the formula for gravitational potential energy: PE = mgh. That is, you should multiply mass, gravity and height.

Look at the equation for kinetic energy.It is clear that relation between mass and kinetic energy is linear (you would get a straight line on the graph), while the relation between speed and kinetic energy is quadratic (you would get a curve, specifically a parabola).

(change in velocity)/(change in time)=avg. acceleration

(-30 m/s)/(15s)= -2 m/s2

In the same manner that we sleep while our beds are burning.