Mechanics

The force that acts on a bowling ball is gravity pulling it downward towards the center of the Earth. Additionally, when the ball is thrown or rolled, external forces such as friction and air resistance will also act on it.

It is the ratio of (mdot*Cp)min/(mdot*Cp)max where the heat exchanger contains two fluids for which the mdot*Cp should be calculated for each to determine which one is greater. by doing so one can define the ability of one fluid to carry thermal/heat energy with respect to the other. so this is a way of saying how well can heat be transferred and so how effective is the heat exchanger

Yes, a solid has a definite mass because the mass of a solid is determined by the total amount of matter it contains, which remains constant regardless of its shape or volume.

none of the above

Force centripetal = (mass * velocity^2) ÷ radius

More mass , more force needed to keep object in the circle

Object going faster, more force needed to keep object in the circle

Larger radius, less force needed to keep object in the circle

That is why mass and velocity are in the numerator ( multipliers)

and Radius is in the denominator ( divider)

In 12 seconds, a car traveling at 87 miles per hour covers 211.2 feet. This is calculated by converting 87 miles per hour to feet per second, then multiplying by the time in seconds.

Barry Sanders ran a 40-yard dash in about 4.37 seconds, which would be roughly 20 mph. However, this speed may not accurately reflect his full top speed during a game.

Yes, the net force is needed to stand up from a chair. When you push against the chair with a force greater than the force of gravity pulling you down, the net force becomes positive and allows you to rise. Without a net force, you would remain seated.

Light travels at 186,000 miles per second, which means you have to travel faster than that to break the light barrier. This feat is technically "impossible", since the faster you move, the more mass you have and the more mass you have, the more energy is required to move you, and by the time you reach the speed of light, you will need to have infinite energy. This doesn't apply to light particles, since they have no mass.

At 500 mph, it would take an airplane 4 hours to fly 2000 miles.

The distance between the two towns is 15 miles. This is determined by multiplying the average speed (45 miles per hour) by the time it takes to drive between the towns (20 minutes converted to hours is 1/3 hour). 45 miles/hour x 1/3 hour = 15 miles.

Different shapes result in different resistances (force opposing gravity) on the object as it falls. An object will continue to accelerate as it falls, until the gravitational force is equivalent to this resistance. This is known as "Terminal Velocity." The lower the resistance is, the higher the resulting speed will be before this equilibrium is reached.

An object with a large surface area or volume (high wind resistance value) and low density (low gravitational force) will fall slower than an object that has a lower surface area (low wind resistance) with a higher density (high gravitational force).

e.g., A large hollow Styrofoam ball will fall much slower than a metal dart.

Fields of science that study machines include robotics, mechanical engineering, computer science, and artificial intelligence. These disciplines investigate the design, development, and functioning of machines to improve their efficiency, intelligence, and capabilities.

At 60 mph it would take 3.41 seconds to cross an American football field.

Yes, balancing the forces acting on an object involves ensuring that the sum of all forces is zero, which means there is no net force acting on the object. This equilibrium condition results in the object either remaining at rest or moving at a constant velocity.

A really long time; about six months at 55 miles per hour.

A plane climbs into the jet stream which is flowing at a rate of 80 miles per hour Traveling with the jet stream for 5 hours the plane covers 1150 miles The plane then reduces its altitude and flies 150.

Yes, but an object with net force of zero may still be moving. The net force is zero if the object is not accelerating.

If an object has no net force acting on it, it will either remain at rest or continue moving at a constant velocity in a straight line, following Newton's first law of motion.

The man would have to go at a speed of 222 miles per hour to cover 555 miles in 2 hours and 30 minutes.

The plane was in the air for 4.5 hours (1,350 miles divided by 300 miles per hour).

The plane was in the air for 4.5 hours. This can be calculated by dividing the distance (1350 miles) by the average speed (300 miles per hour).

Force can be defined as the derivative of momentum with respect to time or: dp/dt = d(mv)/dt

Since the mass stays the same, we can take that out:

m * dv/dt (It's worth noting that this is the derivation of the F=ma equation)

Now to answer your question, this depends on the amount of time the object is being pushed by the wall. If the time is equal, then the wall will apply a greater force on the ball if it bounces back because it has to change the ball's momentum by a greater amount to get it to move back towards the thrower.

Slinky! No, seriously. A slinky at the top of the stairs has POTENTIAL energy, a slinky falling down the stairs has KINETIC energy. Things with the potential to release energy have POTENTIAL energy. Things currently releasing that energy have KINETIC energy. Of course, it could also be a block of uranium, and it's got energy no matter what it's doing. Or it could be a chunk of wood sitting there, it's got thermal & light energy stored inside it, which would be released by rapid oxidization (burning).