A stone dropped from the roof of a single-story building to the surface of the earth:

A.
falls because of the natural tendency of all objects to rest on the surface of the earth.

B.
reaches a maximum speed quite soon after release and then falls at a constant speed thereafter.

C.
speeds up as it falls because the gravitational attraction gets considerably stronger as the stone gets closer to the earth.

D.
speeds up because of an almost constant force of gravity acting upon it.

E.
falls because of the combined effects of the force of gravity pushing it downward and the force of the air pushing it downward.

Marley was the victim of a hoax. The synonym of the hoax is a practical joke, joke, jest, prank, trick, jape, and fraud.

To dupe someone into believing or accepting something untrue and frequently absurd as genuine.

A practical joke, joke, jest, prank, trick, jape, and scam are all synonyms for a hoax.

Marley stayed up late to watch the planet Mars rise in the east. She had read online that Mars was unusually close to the Earth in its orbit and would look nearly as large as the moon.

However, she only saw stars, and the next morning she ended up oversleeping because of her late bedtime. Marley was the victim of a hoax.

Hence a hoax is a correct answer.

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Answer:

C: Every mass exerts a gravitational force on every other mass

This statement is true

Answer:

Explanation:

Remark

The answer is in the formula

E = I * R

Solution

Let the resistance = R

I = 12/R

If we increase the resistance by 20% then we get

R1 = R + (20/100) * R

R1 = R + 1/5 * R

R1 = 6 R/5

What happens to I when you do this

I = 12/(6/5 R)       Effectively you need to treat 6/5 as a reciprocal

I = 12 * 5/6 * R

I = 10 / R

What does this tell you? Since the Resistance has a base value of R, when increased by 20%, the numerator of the fraction is reduced to 10 from 12. In other words the current  is now smaller when R goes up.

Answer:

C

Explanation:

I would have to say C because the girl is constantly moving in the act of serving the volleyball.

Answer:

[tex]F_{k} = 9854N[/tex] Opposite to the motion of the car.

Explanation:

Please find the detailed solution below

Explanation:

A projectile (Cannon ball) is launched at an angle to the horizontal and rises up to a peak while moving horizontally. When it reaches the peak, the projectile starts to fall.

Answer:

the answer will be about 126 rad/s

Explanation:

Answer:

3904 Meters

Explanation:

F = ma

work = F * d

89.1 (9.8)* d        = 815000/.23906                                                                                                     conversion factor  1 j = .23906 cal

d = 3904 meters

Answer:

2.5 kg - m/s

Explanation:

Momentum = m * v = .5 * 5 = 2.5  kg-m/s

Answer:

torques must balance for equilibrium

counterclockwise = clockwise

1.5 X = 4 * 20

x = 80 N-m / 1.5 m = 53 N

(D) is correct

The height to which the weight-watcher must climb to work off the equivalent 991 (food) Calories is 0.59 Km

1 food calorie = 103 calories

Therefore,

991 food calories = 991 × 103

991 food calories = 102073 calories

Multiply by 4.2 to express in joule (J)

991 food calories = 102073 × 4.2

991 food calories = 428706.6 J

E = mgh

Divide both side by mg

h = E / mg

h = 428706.6 / (73.9 × 9.8)

h = 591.95 m

Divide by 1000 to express in km

h = 591.95 / 1000

h = 0.59 Km

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Answer:

(d) is not affected practically

Explanation:

A bird sitting on a high power line is not affected practically.

This is because both of its legs are at the same potential, and current cannot flow through its body.

Answer:

option D

Explanation:

The bird sitting on a high power line but the bird is not touching ground by its body parts .

Hence there is no way electricity can pass through its body to earth

Thus it won't get any shock .

If everything lies perfectly for superposition to occur, the force on a car is 1000 N.

Superposition is the phenomenon of placing one wave over the other so that they coincide. The resultant force will be zero.

The force in kg will be

1mteric ton = 1000 kg

1metric ton per m²= 1000 N

1000 N force is applied to a car, which will be equal and opposite to the massive wave.

The equal force will act on a car equal to 1000 N.

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Answer:

मार्क ASL brainlisessjd

[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

Here's the answer ~

1. The energy that has been given to the solid material is being used to change its phase from solid to liquid.

2. This all energy is converted into latent heat of fusion causing change in state. so there's no increase in temperature.

Answer →

a) The phase of solid material is changing due to Absorption of heat.

b) The energy that is being supplied to it is absorbed by the material to break the intermolecular bonds.

Explanation:

Heat is a mod of transfer of energy, and solid is a giant network of atom or ions closely bounded with high inter molecular forces. When the bonds are formed lead to release in energy hence to break the bond you need to supply energy and that energy supplier is heat. Generally there are two types of heat, one that you sense as rising temperature and another where you see a gradually change in the phase of material. When the heat that you supply is being absorbed that means the energy is being consumed(absorbed) by the material, to break the bonds, and you doesn't sense the temperature of material being raised but the change in state of material from solid→Liquid, solid→gas depends on the type compound, the phase of material changes, same thing happens in reverse case from Gas→Liquid, Liquid→Solid, the energy is released in atmosphere. this absorbed or released energy(heat) is Latent heat.

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Answer:

See below

Explanation:

Coulomb's Law    Force = k q1 q2 / r^2

k = Coulomb's constant = 8.9875517 x 10^9  kg m^3 /s^2 C^2

    Force =  8.9875517 x 10^9   * 7 * 5  / (5925^2)  = 8960.5102 N

Answer:

I believe the answer is esophagus

The magnitude of the electric field will be 64.38 V/m. Mathematically, the electric field is found as the ratio of the voltage per unit length.

A physical field that surrounds electrically charged particles and exerts a force on all other charged particles in the field, either attracting or repelling them, is referred to as an electric field.

The magnitude of the electric field in terms of the pointing vector for this wave  is found as;

[tex]\rm E_{MAX} = \sqrt{S \times c \times \mu_0 }[/tex]

Where,

E is the electric field

c is the speed of light

[tex]\mu_0[/tex] is the permeability

On Putting the given data ;

[tex]\rm E_{MAX} = \sqrt{11.0 \times 3 \times 10^8 \times 4 \times \pi \times 10^{-7}} \\\\\ \rm E_{MAX} =\sqrt{4144.8} \\\\ E_{MAX} =64.38 \ V/m[/tex]

Hence, the magnitude of the electric field will be 64.38 V/m.

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Hubble space telescope, Hubble deep field guide, moon, mercury, Saturn, sun, galaxy messier 101

Answer:

1-Hubble Deep Field Galaxy

2-Galaxy Messier 101

3-Sun

4-Saturn

5-Mercury

6-Moon

7-Hubble Space Telescope

Answer:

√h₁/h₂

Explanation:

In free fall, the square of the time taken by the body is directly proportional to the height from which it is dropped.

Ratio

According to second equation of kinematics for free fall

So

[tex]\\ \rm\Rightarrow h\propto t^2[/tex]

[tex]\\ \rm\Rightarrow h_1:h_2::t_1^2:t_2^2[/tex]

[tex]\\ \rm\Rightarrow t_1:t_2::\sqrt{h_1}:\sqrt{h_2}[/tex]

Wave is best described as a pulse that carries energy and is denoted as option A in this context.

This is a disturbance which carries energy from one place to another without the movement of the matter.

Since matter isn't moved then it is best described as a pulse which carries energy from one place to another.

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Answer:A

Explanation:

Answer:

The distance is shortenend by factor .1715

Explanation:

5 n  = 1/r^2

sqrt (1/5) = r

170 n  = 1 / ( x sqrt(1/5))^2

(xsqrt 1/5)^2 = 1/170

x sqrt 1/5  = .076696

x = .1715    

For a disk whose rotational inertia is 450 kg.m2 hangs from a wire whose torsion constant is 2300 N.m/rad, the angular acceleration is mathematically given as

a =  1.176 rad/s^2

Generally, the equation for the angular acceleration  is mathematically given as

a = torsion constant x theta/inertia

therefore,

a =  2300 x 0.23/450

a =  1.176 rad/s^2

In conclusion, the  angular acceleration  is

a =  1.176 rad/s^2

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Answer:

-2.25

Explanation:

v=u+at

0=9+a(4)

9+4a=0

4a=-9

a= -2.25

the rate of acceleration of the car coming to a stop is 2.25 m/s².

speed is described as. the pace at which an object's location changes in any direction. Speed is defined as the distance traveled divided by the travel time. Speed is a scalar quantity because it just has a direction and no magnitude.

given, A person driving in a neighborhood traveling 9 m/s slows to a stop (0 m/s) over 4 seconds as they approach a stop sign.

The acceleration of the car can be calculated using the formula:

acceleration = (final velocity - initial velocity) / time

Here, the initial velocity is 9 m/s (the speed at which the car was traveling before braking),

the final velocity is 0 m/s (the speed at which the car comes to a stop), and the time taken to stop is 4 seconds. Substituting these values into the formula,

we get:

acceleration = (0 m/s - 9 m/s) / 4 s

acceleration = -9 m/s / 4 s

acceleration = -2.25 m/s²

The negative sign indicates that the car is decelerating, or slowing down.

Therefore, the rate of acceleration of the car coming to a stop is 2.25 m/s².

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Explanation:

w = v/r

= 15/ 45 = 1/3 rads-¹

a = w²r

= 1/9 • 45 = 5 ms-²

F = mv²/r

= 1200• 15• 15/45

= 6000N

The car, when rounding the curve, is pulled towards the center by the friction between it's wheels and the road.

We can confirm that when you travel in an elevator, the utricle and saccule detect when the elevator is moving.

These are small organs located in the inner ear. They serve a very important function in our everyday life. These otolith organs are responsible for the detection of movement and provide us with a sense of spatial orientation. They accomplish this by stimulating very small, hair-like cells with a specialized fluid.

Therefore, we can confirm that when you travel in an elevator, the utricle and saccule detect when the elevator is accelerating or decelerating.

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The force constant that is needed to produce a period of 0.500 s for a 0.0150-kg mass is 2.37 N/m

Period (T) = 0.5 s

Mass (m) = 0.015 Kg

Pi (π) = 3.14

Spring constant (K) =?

The spring constant can be obtained by using the formula for calculating the period of simple harmonic motion. This is illustrated below

T = 2π√(m /K)

Square both side

T² = 4π²m / K

Cross multiply

T² × K = 4π²m

Divide both side by T²

K = 4π²m / T

K = (4 × 3.14² × 0.015) / 0.5²

K = 2.37 N/m

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