PHYSICS HIGH SCHOOL

True or false one of the benefits of using an exercise ball is generally involves the core muscles?

Answers

Answer 1
Answer: the answer is true improve core stability
Answer 2
Answer: This is true in many cases, but not all. There are exercises in which you simply raise and lower an exercise ball over your head (kind of like weight lifting), but whenever the ball is in front of you and you reach out at all with your arms, that is a core workout. 

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What is the kinetic energy of a 1.0-kg billiard ball that moves at 5.0 m/s? A. 5.0 J B. 6.5 J C. 10.0 J D. 12.5 J

Answers

The kinetic energy of a moving body can be determined from its mass and velocity of the body. The kinetic energy of  1.0-kg billiard ball that moves at 5.0 m/s is 12.5 J. Hence, option D is correct.

What is kinetic energy?

Kinetic energy is a form of energy generated in body by virtue of its motion. It is directly proportional to the mass and square of velocity of the body. The equation of kinetic energy is written as follows:

KE = 1/2 mv²

When a body starts moving its kinetic starts to increase while the potential energy drops out. However the total mechanical energy in the system will be conserved.

The mass of the billiard ball is given 1 kg and the velocity is 5 m/s. Then the kinetic energy of the ball is calculated as follows:

KE = 1/2 1 kg × ( 5 m/s )².

    = 1/2 × 25

    = 12.5 J.

Therefore, the  kinetic energy of  1.0-kg billiard ball that moves at 5.0 m/s is 12.5 J. Hence, option D is correct.

To find more about kinetic energy, refer the link below:

brainly.com/question/12669551

#SPJ5
The formula for a kinetic energy (KE) is
KE = 0.5*m*v²

Given m = 1.0 kg, v = 5.0 m/s, so
KE = 0.5*1.0*(5.0)² = 12.5 J

The answer is D.

How much total work is done by the force in lifting the elevator from 0.0 m to 9.0 m?

Answers

The total work is

         (mass of the elevator, kg) x (9.8 m/s²) x (9.0 m)           Joules .

A negatively - charged object has an excess of ?

Answers

The object has an exes amount of electrons

If you observed that an em wave had a wavelength of 10-12m, what sort of wave is it?

Answers

That's a radio wave at a frequency somewhere between 25 MHz and 30 MHz.

How do I compute the resistance in ohms of a lead block 15 cm long and 0.10 cm2 in cross-sectional area. (ρ = 2.2 x 10-5 ohm-cm)

Answers

Resistance is also dependent on the length of a wire where it is expressed as the product of the resistive force and the length of the wire over the cross-sectional area of the wire. Calculation are as follows:

R= pL / A
R = 2.2 x 10^-5 x 15 / 0.10
R = 3.3 x 10^-3 ohms

What do all hydrogen atoms and ions have in common?

Answers

They have the same Number of protons
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