PHYSICS MIDDLE SCHOOL

A ball is moving at 7.0 m/s and has a momentum of 100kg.m/s. What is the balls mass?

Answers

Answer 1

Answer:

Answer:

14 kg

Explanation:

Momentum = mass × velocity

p = mv

100 kg m/s = m (7.0 m/s)

m ≈ 14 kg

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Physic its urgent1/ What is the total distance traveled by the object during the first 3 second

2/What is the average speed of the object during the following interval in t=6 sec and t= 8 sec

Answers

(1) Distance = speed × time

Total distance = 10m/sec × 3sec = 30m

(2) Average speed = (25m/sec + 10m/s) ÷ 2 = 17.5m/sec

The leg's force forward on the foot= 500NThe foot's force forward on the ball= 500N
The ball's force back on the foot= 500N
What is the net force on the ball?
What is the net force on the foot?

Answers

There's so much going on here, in a short period of time.

Before the kick, as the foot swings toward the ball . . .

-- The net force on the ball is zero. That's why it just lays there and
does not accelerate in any direction.

-- The net force on the foot is 500N, originating in the leg, causing it to
accelerate toward the ball.

During the kick ... the 0.1 second or so that the foot is in contact with the ball ...

-- The net force on the ball is 500N. That's what makes it accelerate from
just laying there to taking off on a high arc.

-- The net force on the foot is zero ... 500N from the leg, pointing forward,
and 500N as the reaction force from the ball, pointing backward.

That's how the leg's speed remains constant ... creating a dent in the ball
until the ball accelerates to match the speed of the foot, and then drawing
out of the dent, as the ball accelerates to exceed the speed of the foot and
draw away from it.

You are driving at 35 m/s east and notice another car that is initially located 462 m in front of you and is moving east at 25 m/s. How far do you travel before you pass the other car?

Answers

The easiest way to answer this question is by realizing there are relating the velocities of the two cars. To tackle this problem, you have to understand the picture. Car 1 travels at 35m/s and Car 2 travels at 25m/s. Based on relative velocities, we can understand that Car 1 travels 10m/s faster than Car 2 every second. So we can interpret Car 1's relative velocity to Car 2 as 10m/s. Car 1 needs to travel 10m/s till a point of catching up to Car 2 which is 462m away.

v = 10m/s

d = 462m

v = d/t

(10) = (462)/t

t = 46.2s

So it takes 46.2 seconds for Car 1 to catch up to Car 2, but the question is asking how far does Car 1 travel to catch up. So we have to use Car 1's velocity and not the relative velocity:

v = 35m/s

v = d/t

(35) = d/(46.2)

d = 1617m

Car 1 traveled a total distance of 1617m.

-- You are 462 meters behind.

-- You're gaining on him at the rate of (35m/s - 25m/s)= 10 m/s.

-- At that rate, it'll take you (462m / 10m/s)= 46.2 seconds to over take him.

-- During that time, you'll cover (46.2s x 35m/s)= 1,617 meters.

When a wire is made thicker its resistance what?

Answers

Making a wire thicker has the same effect as making a road wider. It makes it easier for the electron traffic to flow. The resistance decreases, and the current (traffic) increases.

10 POINTS!!! Determine the pressure of your book in pascals (Pa). Show your work! (the pressure of the book in psi is 0.03 psi) Also the weight of the book is 3 lbsHInt: 1 Pa = 1 N/m^2 Weight (force) = ma 1 kg = 2.2 lbs 1 inch = 2.54 cm 1m = 100 cm

Answers

You've listed a lot of data here, in both metric and customary units,
and I'm not even sure it's all needed. Let me try and boil it down:

Pressure on a surface =
   (total force on a surface) divided by (area of the surface).

The answer to the question is the pressure expressed in pascals.
There's actually enough information here to answer the question
in 2 different ways. We could ...

-- simply convert (0.03 pound per inch²) to pascals, or
-- go through the whole calculation of force, area, and then their quotient.

To me, converting 0.03 psi to Pa looks easier.

-- 1 pascal = 1 newton / 1 meter²

-- On Earth, 1 kilogram of mass weighs 9.8 Newtons and 2.2 pounds.
From this, we can calculate that

2.2 pounds of force = 9.8 newtons of force.

   1 pound = 4.45 newtons

(0.03 pound/inch²) x (4.45 newton/pound) x (1inch/2.54cm)² x (100cm/1m)² =

(0.03 x 4.45 x 1² x 100²) / (2.54² x 1²)    newton/meter² = 206.9 Pa .

PLEASE HELP ME I WILL BE RATING BRAINLIEST VERY URGENT: Can the number of electrons passing a point in a circuit be a decimal?

Answers

Answer: No

Explanation:

Electrons have negative charge. It's charge can be decimal because it's about 1.6*10-19 But number of electrons passing through a metal cannot be a decimal number. If you use Q = ne

Q - total charge

e - Charge of an electrone

n - Number of electrons

You might get decimal value for n but it doesnt mean that it shoud have decimal value . Then you have to get nearest less digit value for answer. We cant divide electrons in to pieces

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