Why are objects that fall near Earth's surface rarely in free fall?
O Gravity does not act on objects near Earth's surface.
Air exerts forces on falling objects near Earth's surface.
The objects do not reach terminal velocity
O The objects can be pushed upward by gravity.

Answer:

in real life yes it's true because of energy lost in another way that we do not want. like car engine lost some energy as heat. So the energy from gasoline can't converted 100% to move the tire. Maybe it only 40-60 % energy use for move and the rest lost as heat and other

but sometime it can be 100% of efficiency on physics text book so that we can learn physics in the easiest way.

Answer: width = 27.94 cm

Explanation:

Given  a sheet of a standard-sized (8.5in x 11.0in) loose-leaf notebook paper.

From the value given, the width is 11.0 inches

To make the measurement in centimeters, we will convert inches into centimeters.

1 inche = 2.54 centimeters

That is, 11 × 2.54 centimeters = 27.94 cm.

Therefore, the width is 27.94 cm.

[tex]solution \\ mass = 1.5 \: kg \\weight = m \times \: g \\ \: \: \: \: \: \: \: \: \: \: \: \: = 1.5 \times 9.8 \\ \: \: \: \: \: \: \: \: \: = 14.7 \: newton[/tex]

hope this helps...

Good luck on your assignment...

Given:

To find out:

Find the weight?

Formula used:

Weight = m × g

Solution:

Weight of book = m × g

★ Putting the values in the above formula,we get:

Weight of book = 1.5 × 9.8

= 15/10 × 98/10

= 1,470/100

= 14.7 kg.m/s²

Answer: a. boiler - I. part of a coal-fired power plant.

b. combustion chamber - I. part of a coal-fired power plant.

c. condenser - III. part of a coal-fired power plant and part of a nuclear power plant.

d. control rod - I. part of a coal-fired power plant.

e. generator- III. part of a coal-fired power plant and part of a nuclear power plant.

f. turbine - III. part of a coal-fired power plant and part of a nuclear power plant.

Explanation:

a. Boiler: It is used in the coal power plant to heat the water used for producing electricity. The boiler keeps the temperature of water or steam at a desired level.

b. Combustion chamber: It is used for combustion of coal and using thermal energy for electricity generation.

c. Condenser; It is used in both nuclear and coal power plants. It condense and receive from the turbine.

d. Control rod: It is used in the nuclear power plant for controlling the nuclear fission and fusion reactions of heavy metals.

e. Generator: It converts the thermal energy into electrical energy.

f. Turbine: The turbine blades move with the effect of steam or any form of energy and the energy so produce is used for generating electricity in generator.

Answer:

see explanation

Explanation:

A,B,C,E

B.

Because its copper

Raymond Cattell created the 16PF self-inventory assessment by taking 4,504 personality traits and removing all of the synonyms.

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Raymond Cattell created the 16PF self-inventory assessment by removing the synonyms from the personality traits.

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Answer:

13.4 m/s

Explanation:

Write down what you have, so:

V0=8 m/s

a=2.7 m/s^2

t=2 seconds

We are trying to find final velocity, so we will use vf = v0 + at

From there, we plug in the given values.

vf = 8 m/s + (2.7 m/s^2 x 2 seconds)

vf = 13.4 m/s

Answer:

about 13s

Explanation:

Answer:

Over Here

Explanation:

Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

Answer:

b

Explanation:

Answer:1) the total distance is the sum of the two distances

60 km +  45 km = 105 km

2) The displacement is the net movement, or the difference between the initial position and the final position

Call x the initial position, then the final position is x + [60km - 45km]

And the displacement is x + (60km - 45km) - x =60km -45 km = 15 km

Explanation:

Answer:

A.The direction in which light is bent

Explanation:

That why I the topic thin lenses we learn how to draw Ray's of light

Answer:

a

Explanation:

Answer: momentum = 40kgm/s

Explanation:

Given that the

Mass M = 10kg

Height H = 80 cm = 0.8m

g = 10m/s^2

The velocity of the dumbbell as it fall can be calculated by using the formula;

V^2 = U^2 + 2gH

Since the dumbbell fell from rest, initial velocity U = 0

Substitute g and H to get final velocity V

V^2 = 0 + 2 × 10 × 0.8

V^2 = 16

V = sqrt(16)

V = 4 m/s

Momentum is the product of mass and velocity. That is,

Momentum = MV

Substitute mass M and V into the formula

Momentum = 10 × 4 = 40kgm/s

Therefore, 40 kgm/s momentum will be transferred as the dumbbell fall to the floor.

Answer: B

The forklift is doing positive work on the object because the direction of force and the direction of motion are the same. The force of gravity is doing negative work on the object because it is acting opposite to the direction of motion. 

Explanation: The work done in lifting an object up is positive when the direction of the displacement and the force applied are in the same direction.

The work will be negative if force and direction of the motion are opposite to each other.

Also, force of gravity is considered positive when an object is moving toward the gravity. That is coming downward. Otherwise, it's negative when it's moving in the opposite direction.

When a forklift raises an object, the forklift is doing positive work on the object because the direction of force and the direction of motion are the same. The force of gravity is doing negative work on the object because it is acting opposite to the direction of motion.

The forklift is doing positive work on the object because the direction of

force and the direction of motion are the same. The force of gravity is

doing negative work on the object because it is acting opposite to the

direction of motion.

When a forklift is used to raise an object , it exerts a force which acts in the

same direction with its motion which signifies that it is doing a positive

work.

The force of gravity on the other hand is doing a negative work as it acts

opposite to the direction of the force and motion.

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Answer:

A)

Explanation:

Answer:The starting angle of a pendulum does not affect its period for .

Explanation: however, the period increases with increasing . The starting angle of a pendulum does not affect its period for.

Answer:

1.) U = 39.2 m/s

2.) t = 4 seconds

Explanation: Given that the

height H = 78.4m

The projectile is fired vertically upwards under the acceleration due to gravity g = 9.8 m/s^2

Let's assume that the maximum height = 78.4m. And at maximum height, final velocity V = 0

Velocity of projections can be achieved by using the formula

V^2 = U^2 - 2gH

g will be negative as the object is moving against the gravity

0 = U^2 - 2 × 9.8 × 78.4

U^2 = 1536.64

U = sqrt( 1536.64 )

U = 39.2 m/s

The time it takes to reach its highest point can be calculated by using the formula;

V = U - gt

Where V = 0

Substitute U and t into the formula

0 = 39.2 - 9.8 × t

9.8t = 39.2

t = 39.2/9.8

t = 4 seconds.

Answer: 80

Explanation:

The question is incomplete, There is no specific time for the specific velocity, which is not provided in this question instead of giving the total time interval from 0sec to 80 sec. According to my assumption, I think the net displacement will be 20 m. The correct answer will be option D.  

Net displacement is the total change in the position of an object, taking into account both the magnitude and direction of its motion. It is a vector quantity and is expressed in terms of distance and direction.

In other words, it is the final position of an object relative to its initial position, irrespective of the path taken. It is calculated by finding the vector difference between the final and initial positions of the object.

For example, if an object moves 10 meters to the east and then 5 meters to the north of its starting position, then its net displacement would be the vector sum of these two displacements, which is the diagonal distance between its starting and final positions.

Here in the Question,

To calculate the net displacement of the particle between 0 seconds and 80 seconds based on the given options, we can use the fact that the net displacement is the same as the final position minus the initial position.

Let's assume that the initial position is zero.

Option A. If the net displacement is 160 meters, the final position would be 160 meters. However, looking at the velocities given, we can see that the particle goes back and forth, so it does not make sense for the net displacement to be larger than the maximum displacement in one direction.

Option B. If the net displacement is 80 meters, the final position would be 80 meters. This option could be possible if the particle moves in one direction for a while and then moves back to its initial position. This is incorrect.

Option C. If the net displacement is 40 meters, the final position would be 40 meters. This option is also possible if the particle moves in one direction for a shorter period of time. This is not relevant to the question.

Option D. If the net displacement is 20 meters, the final position would be 20 meters. This option could be possible if the particle moves in one direction for a very short period of time. This is most relevant to the Question.

Option E. If the net displacement is 0 meters, the final position would be the same as the initial position, which is zero. This option could be possible if the particle moves back and forth such that the positive displacements cancel out the negative displacements.

Therefore, based on the given options, the correct answer for the net displacement of the particle between 0 seconds and 80 seconds is option D: 20 meters.

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Answer: frequency is the answer to this question

Answer:

frequency

Explanation:

c a n v a s / a p e x :))

Answer: 2.34s

Explanation:

Given the following :

Horizontal Velocity(V) = 3.22m/s

Horizontal Distance = 7.54m

Therefore, the time spent in the air can be calculated thus:

Using the relation:

Speed = distance / time

3.22m/s = 7.54m / time

Time = 7.54m / 3.22m/s

Time = 2.34s

Answer:

C: Light travels from the Sun to the grass and is then reflected to your eyes.

Explanation:

Our eyes don't produce light but detect light (so answer A is not correct)

The grass doesn't produce light unless it is burning (discard answer B)

Answer C is the correct one.

The light we detect from the grass is not light bounced off the sky, it comes directly from the grass to your eyes (you are not looking at the sky when you see the grass) Discard answer D

Answer: 1.3 m

Explanation:

From the figure attached, 3 materials are involved. A 14 kilogram beam hinged at one end, a 6.0-kilogram triangular object and a 7.5-kilogram capital I-shaped object.

Let take the moment at the hinge axis.

The moment for the beam will be

14 × ( 0.36 + 0.53 ) = 12.6

The moment of the triangle object will be 6 × 0.36 = 2.16

The moment of capital I shape will be

7.5 × ( 0.36 + 0.53 + 1.92 ) = 21.075

The total moment = 12.6 + 2.16 + 21.075

The total moment = 35.835

The total mass = 14 + 6 + 7.5 = 27.5

The center of mass of the entire system must be:

X = total moment ÷ total mass

Substitute both in the formula

X = 35.835/27.5

X = 1.3 m.

Therefore, The center of mass of the entire system must be 1.3m

Answer: M = 1797.75 kg

Explanation:

given parameters are;

speed V = 26.7 M/S.

momentum P = 4.8×10^4 KGM/S.

What was the mass of the V. A-3?

Momentum P is the product of mass and velocity. That is, P = MV

Substitute V and P into the formula

4.8×10^4 = 26.7 × M

Make M the subject of formula

M = 4.8×10^4/ 26.7

M = 1797.75 kg

Therefore, the mass of the V. A-3 was 1797.75 kg

Answer:

Forensic scientists determined that the woman’s body was thrown off the cliff because after considering the velocity and angle of the projectile needed in relationship to the cliff she could not have reached those speeds and cleared the safety fence 4m away from the cliff’s edge. She would have been going faster than a 5.5 minute mile pace and she was not an athletic person.

** Just make sure to change the format and/or wording. Hope I was helpful :-)

The woman’s body was thrown instead of concluding that she jumped off the cliff as there has more initial speed than regular which is provided during throw.

When a particle is hurled obliquely near the surface of the earth, it travels along a curved path while accelerating continuously in the direction of the planet's center (we assume the particle stays close to the surface of the globe). Such a particle's motion is known as projectile motion, and its route is referred to as a projectile.

Given: She landed 12 meters from the cliff's base.

And when she jumped off the cliff, her estimated launch speed was 10.87 miles per hour. She could have avoided having to go a considerable distance in order to jump over the cliff by using the safety barrier that was 4 meters away.

Hence, Instead of drawing the conclusion that the woman leaped from the cliff, the body of the woman was flung since throwing provides more initial speed than usual.

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Answer:

C

Explanation:

Answer:

anser is c i just took test

Explanation: