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3 years ago

A 1,000 kg ball traveling at 5 m/s would have kinetic energy

Physics

1 answer:

MatroZZZ [7]3 years ago

6 0

Answer:

12500 J = 12.5 kJ

Explanation:

Kinetic energy is the energy possessed by a moving object solely due to its motion.

You can get the K.E. of an object using the equation,

K.E. = (1/2)mv²

So you get, for ball

K.E. = (1/2)×1000×5² = 12500 J = 12.5 kJ

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Zeros are always considered significant digits when they are to the left of the decimal point

maksim [4K]

Answer:

Zeros to the left of a decimal can be insignificant place holders, such as in 0.043 (two significant figures).

They can be significant if they are between two digits who themselves are significant, such as in 101.000 (three significant figures).

In the case of a number like 1,000 we can see there is only one significant figure. The zero digits are not between sigfigs.

7 0

3 years ago

WILL MARK BRAINLIEST! The driver of a pickup truck going 120 km/h applies the brakes, giving the truck a uniform deceleration of

Rudik [331]

First put the speed in m/s. 120km/h = 33.33m/s. Now the position function is the integral of velocity, and velocity is in turn the integral of acceleration. The velocity is:
$v= \int\limits^{} _ {} {-5} \, dt =-5t+33$
Now we integrate this expression to get the position. The constant of integration will be the distance the truck travels.
$s= \int\limits^{} {-5t+33} \, dx =- \frac{5}{2}t^2+33.33t-35=0$
Here we set the distance, 35m as negative because I assumed the stopping point of the truck is the origin. Putting t=0 shows it starts at -35m.
Now solve the following equation for the time, t using the quadratic equation:
$s=- \frac{5}{2}t^2+33.33t-35=0$
and choose the value t=1.149s

7 0

3 years ago

Thus, an object with a momentum of 0 (does or does not have

creativ13 [48]

Answer:

At momentum zero, kinetic energy = zero

At momentum 10, kinetic energy can never be equal to zero.

Explanation:

An object is said to have zero momentum when either its mass or its velocity is zero. Since, negetive mass doesn't exist, the velocity should be zero and this case, the object must be at rest. Momentum is zero when change in velocity is zero, but kinetic can never be zero when body is motion or has a momentum of 10.

5 0

2 years ago

A fully loaded tractor-trailer traveling at 55 mph could take up to ____ to come to a complete stop.

Leona [35]

Answer:

400 feet would be the correct answer

Hope it helped :3

3 0

3 years ago

A man lifts a load of 20 kg Frome The ground And put it on his head 1.4m above the ground . Calculate the work done by the man.

Leni [432]

Given parameters:

Mass of load = 20kg

Height of man = 1.4m

Unknown:

Work done by man = ?

Work done is the force applied to move a body in a particular direction.

Often times, it is mathematically expressed as;

Work done = Force x distance

In this problem, we use the formula of potential energy to find the work done;

Work done = Potential energy = mgh

where m is the mass of the load

g is the acceleration due to gravity = 9.8m/s²

h is the height of the body

Now, input the parameters, and solve for work done;

Work done = 20 x 9.8 x 1.4 = 274.4J

The work done by man is 274.4J

5 0

2 years ago