Why can velocity and speed be interchanged in the formulas

Answers

Answer 1

Answer: Because in high school physics, all the problems you're given to deal with
involve motion in a straight line, so you never have to deal with changes in
the direction of motion. If it's OK to ignore direction, then speed and velocity
appear to be the same thing.

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Discuss a physical activity that benefits muscular strength and describe at least two other benefits of performing this activity.
Which of the following helps support the argument that light behaves like a particle? A. Sound, which travels in waves, can't travel through a vacuum. B. Interference is observed with light. C. Diffraction is observed with light. D. Unlike sound, light waves don't need a medium to self-propagate

What is the momentum of a 75.0-kilogram defensive back chasing the fullback at a velocity of 5.00 m/sec.

Answers

Answer : The momentum is, 357 kg.m/s

Explanation :

Momentum : It is defined as the motion of a moving body. Or it is defined as the product of mass of velocity of an object.

Formula of momentum is:

$p=mv$

where,

p = momentum

m = mass = 75.0 kg

v = velocity = 5.00 m/s

Now put all the given values in the above formula, we get:

$p=75.00kg* (5.00m/s)=357kg.m/s$

Therefore. the momentum is, 357 kg.m/s

75 kg × 5 m/sec = 375 kgm/s

Hope this helps :)

Which of the following best describes the magnetic field lines around an isolated, permanent bar magnet?A. The field lines go from the magnet's south pole into its north pole.
B. The field points out along radial lines from the bar magnet, extending straight out to infinity.
C. The field lines go from the magnet's north pole into its south pole.
D. The field points straight into the bar magnet along radial lines that extend to infinity.

Answers

Correct Answer:
Option C. The field lines go from the magnet's north pole into its south pole.

The magnetic field lines of a magnet always emerge from its North pole and enter back in the south pole, as shown in the image attached with.
Therefore, option C is the correct answer

Answer:

Explanation:

Which of the following makes gravity increase?A.The mass of forming objects increases.

B.The mass of forming objects decreases.

C.The spherical shape of planets provides the momentum needed to increase gravity.

D.The mass of forming objects is constantly the same.

Answers

The answer is A. The mass of forming objects increases.

Gravity between objects depend on two things: distance and mass. The farther objects are apart, the lower the gravity. However, the mass of an object is directly proportional to gravity. As mass increases in an object, the gravity increases as well.

Base on the given choices above, the correct answer that corresponds to the question where it can explain as to what makes gravity increase is because of the spherical shapes of the planets. It is because it has the ability to provide momentum. In which momentum has the capability of providing mass in motion, allowing the gravity to increase.

What is the kinetic energy of an object that has a mass of 30 kilograms and moves with a velocity of 20 m/s?A. 12,000 J
B. 6,000 J
C. 2,940 J
D. 5,880 J

Answers

Kinetic Energy = (1/2) (mass) (speed)² .

Just take that formula, write "30" in place of 'mass', write "20" in place
of 'speed', then do the arithmetic on the right side and you'll have the
kinetic energy. When all the measurements are in SI units, you can
do that.

(Don't forget about the ' 1/2 ', and don't forget to square the speed.)

Device that measures electric current

Answers

This device is called an ammeter.

What is refractive index?

Answers

The refractive index of a substance is the ratio . . .

(speed of light in vacuum) divided by (speed of light in the substance) .

So the speed of light in a substance is

(299,792,458 meters per sec) divided by (the refractive index of the substance).

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