Please help which one !!

Answer:

t = 0.0689 s

Explanation:

Given that,

Mass of a basketball, m = 0.622 kg

Initial velocity, u = 4.23 m/s (downward or negative)

Final velocity, v = 3.85 m/s (up of positive)

Average force, F = 72.9 N

We need to find the time it was in contact with the floor. The force is given by :

[tex]F=ma\\\\F=m\dfrac{v-u}{t}\\\\t=\dfrac{m(v-u)}{F}\\\\t=\dfrac{0.622\times (3.85-(-4.23))}{72.9}\\\\t=0.0689\ s[/tex]

So, the time of contact is 0.0689 s.

to get weight multiply Mass by 9.8

weight =9.8x15=147N

Answer:

Sea salt is harvested by evaporating the ocean water away and generally has little to zero processing involved. Major sea salt manufacturers pump sea water into huge shallow “ponds” and allow the sun to evaporate the water... Before harvesting seawater, be sure the body of water you are using is not polluted.

Explanation:

hope it helps, please mark as brainliest

Answer:

2413

Explanation:

If your on Acellus 2413 is what you want to put in

Answer:

C. 5.8 m/s

Explanation:

You just need to multiply the rate of gravity, 9.8 m/s/s, by 0.59, time. You would get 5.782 so you would round it up to 5.8

Answer:21

Explanation:every body said

Answer:

if the tempertaure is increase it effects us very badly. it affects not only us . it effects our whole enviroment.

Answer:

true

Explanation:

The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed. For example, the carbon atom in coal becomes carbon dioxide when it is burned. The carbon atom changes from a solid structure to a gas but its mass does not change.

Answer:

Steam distillation is a separation process which consists in distilling water together with other volatile and non-volatile components.

Answer:

At the Berlin 2009 World Championships, Bolt set a world record time of 9.58 seconds for the 100m race, notching a top speed of 27.8 miles per hour (44.72 kilometers per hour) between meters 60 and 80, with an average speed of 23.5 mph.

Explanation:

Answer:

50m

Explanation:

Answer:

answer is in photo

Answer: positive

Explanation: because opposites attract and north=positive and south=negative the answer should be positive.

The polarity of the red tip of the compass needle must be at the north of the earth, since it points toward the south pole of the magnet.

Polarity of a magnet is defined as the orientation of both the north and south poles of the magnet in space.

Here,

We know that, the opposite poles attract.

The magnetic needle is arranged in a such a way that, the red tip of the magnetic compass needle is actually pointing towards the geographic north pole of the earth.

In order to point the compass needle towards the magnetic south pole, the south pole of the magnet must be located in the geographic north pole.

Hence,

The polarity of the red tip of the compass needle must be at the north of the earth, since it points toward the south pole of the magnet.

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Answer:

gravitational potential energy and kinetic energy

Explanation:

Answer:

Kyra is more precise.

Explanation:

Kyra is more precise as she has included the exact point second it had dissolved whereas Pari just rounded it  to the closest number making her write a whole number that was rounded down.

Answer: no it shouldn't be

Explanation:

Given :

A mover slides a refrigerator weighing 650 N at a constant velocity across the floor a distance of 8.1 m.

The force of friction between the refrigerator and the floor is 230 N.

To Find :

How much work has been performed by the mover on the refrigerator.

Solution :

Since, refrigerator is moving with constant velocity.

So, force applied by the mover is also 230 N ( equal to force of friction ).

Now, work done in order to move the refrigerator is :

[tex]W = Force\times distance\\\\W = 230 \times 8.1\ N\ m\\\\W = 1863\ N\ m[/tex]

Hence, this is the required solution.

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 75 × 3

We have the final answer as

Hope this helps you

Answer:

The momentum of the ball at the maximum height is zero (0 kg.m/s).

Explanation:

Given;

mass of the ball, m = 0.17 kg

initial velocity of the ball, u = 12 m/s

acceleration due to gravity, g = 9.81 m/s²

At maximum height the final velocity of the ball, v = 0

Momentum of the ball at the maximum height is given as;

P = mv

P = (0.17)(0)

P = 0 kg.m/s

Therefore, the momentum of the ball at the maximum height is zero (0).

Answer:

hello your question is incomplete below is the complete question

A 2.0 kg block starts from rest on a positive x axis 3.0m from the origin and thereafter has an acceleration given by a= 4.0i - 3.0jin m/s2. At the end of 2.0 s, its angular momentum about the origin is ______.

answer : L = ( 2 kg ) [(-18m^2/s)k]

Explanation:

velocity vector(v)  = (4.0i - 3.0j )(2.0s)

position vector(r) = ( 3.0m)i

determine the angular momentum about the origin

L = m ( r * v )

attached below is the detailed solution

Answer:

Explanation:

Given the acceleration,

[tex]v(t) = 4ti - 3tj[/tex]

So,

[tex]v(2) = 8i - 6j[/tex]

similarly,

[tex]x(t) = (3 + 2t^2) i - 1.5t^2 j[/tex]

so,

[tex]x(2) = 11i - 6j[/tex]

Angular momentum,

[tex]=mx(2)*v(2)\\\\=2*((-6x0-0x-6)i +(0x8-11x0)j +(11x-6--6x8)k)\\\\=2*(0i +0j -18k)\\\\=(-36kg.rad/s)k[/tex]

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Answer:

Explanation:

From the question we are told that

   The mass of the tennis ball is  [tex]m = 0.060 \ kg[/tex]

    The speed is  [tex]u = 15 \ m/s[/tex]

    The initial height of the ball is  [tex]h_o = 2.2 \ m[/tex]

     The height considered is  [tex]h = 9.5 \ m[/tex]

Generally the time taken to reach the considered height is mathematically evaluated from the equation of motion as follows

           [tex]h = h_o + ut - \frac{1}{2} gt^2[/tex]

=>         [tex]9.5 = 2.2 + 15t - \frac{1}{2} * 9.8 t^2[/tex]

=>         [tex]7.3 = 15t - 4.9t^2[/tex]

=>          [tex]4.9t^2 -15t + 7.3[/tex]

solving the above equation using quadratic formula

           [tex]t= 0.6070 \ s[/tex] and  [tex]t_1 = 2.454 \ s[/tex]

Generally from kinematic equation we have that

        [tex]v = u - gt[/tex]

=>     [tex]v= 15 - 9.8 * 0.6070[/tex]

=>      [tex]v= 9.0514 \ m/s[/tex]

Note if we had used the second values of time the velocity at 9.5 \ m would have been negative which is not correct given that at maximum height velocity is zero

Answer:

The velocity of the two cars is 10 m/s after the collision.

Explanation:

Law Of Conservation Of Linear Momentum

The total momentum of a system of bodies is conserved unless an external force is applied to it. The formula for the momentum of a body with mass m and velocity v is

P=m.v

If we have a system of bodies, then the total momentum is the sum of them all

[tex]P=m_1v_1+m_2v_2+...+m_nv_n[/tex]

If some collision occurs, the velocities change to v' and the final momentum is:

[tex]P'=m_1v'_1+m_2v'_2+...+m_nv'_n[/tex]

In a system of two masses, the law of conservation of linear momentum  takes the form:

[tex]m_1v_1+m_2v_2=m_1v'_1+m_2v'_2[/tex]

If both masses stick together after the collision at a common speed v', then:

[tex]m_1v_1+m_2v_2=(m_1+m_2)v'[/tex]

The car of mass m1=1000 Kg travels at v1=25 m/s and collides with another car of m2=1500 Kg which is at rest (v2=0).

Knowing both cars stick and move together after the collision, their velocity is found solving for v':

[tex]\displaystyle v'=\frac{m_1v_1+m_2v_2}{m_1+m_2}[/tex]

[tex]\displaystyle v'=\frac{1000*25+1500*0}{1000+1500}[/tex]

[tex]\displaystyle v'=\frac{25000}{2500}[/tex]

v' = 10 m/s

The velocity of the two cars is 10 m/s after the collision.

Please find attached photograph for your answer.

Answer: Fg < Fq

Explanation: just took the lab test edge 2020

The electromagnetic force is greater than the gravitational force option third Fg < Fq is correct.

It is a force imposed by one charge on another as a result of the field. The electrostatic force produced by one line charge on another line charge separated by r is determined by the charge potency of each charge as well as the separation distance between them.

Force of gravity is given by:

[tex]\rm F_g=\dfrac{Gm_1m_2}{r^2}[/tex]

The electrostatic force is given by:

[tex]\rm F_q = \dfrac{kq_1q_2}{r^2}[/tex]

On the atomic scale, electrons, for example, have very little mass but a very large charge. As a result, electromagnetic forces rule.

Thus, the electromagnetic force is greater than the gravitational force option third Fg < Fq is correct.

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Explanation:

d=m/v. volume in cm^3 is 10x4x15=600cm^3. 31g/600cm^3 converts to .031kg/.0006m^3.

Answer:

2m 13[tex]\frac{1}{3}[/tex]s

Explanation:

1.5m = 1s

200m = [tex]\frac{200}{1.5}[/tex] × 1s

          = 133[tex]\frac{1}{3}[/tex]s

          = 2m 13[tex]\frac{1}{3}[/tex]s

Answer:

Chemical energy transformations take place from the outlet charger to the ringing phone.

Explanation:

chemical energy

While charging the mobile electrical energy gets transformed into chemical energy. Most of the contemporary mobile phone batteries are lithium-ion batteries where the power is saved by the chemical transformations in the ionic structure of the battery.  When the power gets into the mobile phone it is transformed and collected as chemical energy inside of the battery and when we utilize the mobile the earlier saved chemical energy is again transformed into electrical energy.

The energy transformation that takes place from the outlet charger to the

ringing phone is electrical energy from the outlet is converted to chemical

energy and back to electrical energy and sound energy when the phone is

being used and ringing.

The charger provides a source of electrical energy which gets converted to

chemical energy stored in the battery. During use, the chemical energy gets

converted to electrical energy to power the phone and to sound energy

when it rings with heat energy being dissipated also.

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Answer:

D H2 + O2 ---> H2O

Explanation:

Answer:

I am not sure what the answer is but keep reading.

Explanation:

The answer is not D or A for sure

Answer:

Weight. Recall that the acceleration of a free-falling object near Earth's surface is approximately g=9.80m/s2 g = 9.80 m/s 2 . The force causing this acceleration is called the weight of the object, and from Newton's second law, it has the value mg.

Explanation: