PHYSICS HIGH SCHOOL

John is traveling north at 20 meters/second and his friend Betty is traveling south at 20 meters/second. If north is the positive direction, what are John and Betty's speeds?

Answers

Answer 1
Answer:

Answer:

The John 's speed is 20 m/s.

The Betty's speed is 20 m/s

Explanation:

Given that,

John is traveling north at 20 meters/second and his friend Betty is traveling south at 20 meters/second.

We need to calculate the John and Betty's speeds

We know that,

The speed is a scalar quantity. its has only magnitude.

Hence, The John 's speed is 20 m/s.

The Betty's speed is 20 m/s
Answer 2
Answer: Both of their speeds are 20 m/s.
Direction is not involved in describing speed.

Related Questions

Name the following compound: CH2 ≡ CH2
Johannes Kepler is best known for his work on planetary motion. a. Trueb. False
A fixed mass of gas has a volume of gas of 25cm3. the pressure of the gas is 100kPA. the volume of the gas is slowly decreased by 15cm3 at a constant temperature. what is the change in the pressure of the gas?a) 67kPAb) 150kPAc) 170kPAd) 250kPAgive reasons
A scientist wants to learn about Earth's oceans. Which of the following spheres should she most directly study? (2 points)OaAtmosphereObCryosphereOcGeosphereOdHydrosphere
Snowshoes enable a person to walk on deep snow because the snowshoesa. decrease the person’s weight on the snow.b. increase the area over which the person’s weight is distributed.c. increase the pressure on the snow.d. increase the buoyancy of the person.

What’s the kinetic energy of the object? Use .Erica is competing in the shot put event at a track meet. She hurls a shot with a mass of 4 kilograms at a speed of 9 meters/second. The shot’s kinetic energy is joules.

Answers

The kinetic energy of an object varies directly with the square of the speed of an object. The required kinetic energy of the shot is f 162 J.

What is Kinetic Energy?

The energy possessed by an object by its motion is known as the object's kinetic energy. It depends on the speed and mass of the given object.

Given data -

The mass of shot put is, m = 4 kg.

The speed of shot put is, v = 9 m/s.

The mathematical expression for the kinetic energy of the shot put is,

KE = (1)/(2) m v^(2)

Solving as.

KE = (1)/(2) * 4 * 9^(2)\n\nKE = 162 \;\rm J

Thus, we can conclude that the required kinetic energy of the shot is of 162 J.

Learn more about the kinetic energy here:

brainly.com/question/999862

Answer:

We have: K.E. = mv² / 2

here, m = 4 Kg

v = 9 m/s

Substitute their values into the expression:

K.E. = (4)(9)² / 2

K.E. = (4)(81) / 2

K.E. = 324 / 2

K.E. = 162 Joules

Explanation:

In short answer: it would be K.E.=162 Joules

What's the formula to find out power

Answers


In general, 

                 Power = (energy moved) / (time to move the energy) .

If it's mechanical power, then     

                 Power = (work done) / (time to do the work) .

If it's electrical power, then it can be any one of these:

                 Power  =  (volts)  x  (amperes)

                 Power  =  (volts)²  /  (resistance, ohms)

                 Power  =  (amperes)²  x  (resistance, ohms) .

Whatever kind of energy you're dealing with, power always
turns out to be

                  (amount of energy produced, used, or moved)
divided by
                  (time taken to produce, use, or move the energy) .          

Your shopping cart has a mass of 65 kilograms. In order to accelerate the shopping cart down an aisle at 0.30 m/s2 What force would you need to use or apply to the cart. I don't know how to solve this

Answers


Use Newton's second law of motion:

         Force = (mass) x (acceleration) .

Take that formula, write ' 65 kg ' in place of 'mass', and
write ' 0.3 m/s² ' in place of 'acceleration', and solve it
for Force.

I know absolutely positively that you can take over and finish it
now, because only an hour ago, you thanked me for solving the
exact same problem for somebody else, and the entire solution
was right there, WITH the answer !

How should you test a hypothesis?

Answers

The only way you can test a hypothesis is when you done your experiment or whatever you're doing, then you look back to your hypothesis statement then you see if you're right or wrong!

Two objects, one with a mass of 2 kg and one with a mass of 3 kg are attracted to each other by a gravitational force. If the force on one mass is 4 N, what is the force on the other mass?

Answers

By Newton's 3rd law: That for every action there is an equal and opposite reaction.

So if force on one mass is 4N, then the force on the other mass is -4N.

A glass lying on table doesn't possess friction.why?

Answers

becsud it's not moving
Other Questions
Research indicates that inattentional blindness often decreases when people work on tasks that require a great deal of attention. Please select the best answer from the choices provided T F
Frequency corresponds to the perception of a sound's A) Loudness B) Timbre C) Pitch D) Duration
A piece of metal and a piece of brick are both sitting in the sun if both are the same mass what property of matter will make the metal feel hotter to touch
Lara has noticed that all of her friends are very careful about what they eat, and they are all much thinner than she is. She wants to be healthy, but she really wants to fit in with her friends. What is the best step for Lara to take?A. Talk to a trusted adult to help her evaluate her eating and exercise in a healthy way.B.Ask her friends how they stay so thin, and use the same strategies.C. Find new friends who are not as thin so she doesn't feel any pressure.D.Try out the newest diet she's seen advertised on TV to help her lose the weight she wants to lose.