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KATRIN_1 [288]
3 years ago
13

A bowling ball with a negative initial velocity slows down as it rolls down the lane toward the pins. Is the bowling ballâs acce

leration positive or negative as it rolls toward the pins?
Physics
1 answer:
stiv31 [10]3 years ago
5 0

Answer:

positive

Explanation:

The ball is rolling down with a negative velocity, but the velocity is slowing down. therefore the velocity must increase in order for the ball to slow down.

For example let the ball's initial velocity be -15 m/s. and it  is slowing down to let's say -13 m/s. Well this means that it's velocity has increase by 2 m/s. So, its acceleration is positive.

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What does the bohr model look like?
sergeinik [125]
Pic of Bohr Model attached

7 0
4 years ago
Read 2 more answers
A small segment of wire contains 10 nC of charge. The segment is shrunk to one-third of its original length. A proton is very fa
Alik [6]

To solve this problem we will apply the concepts related to the electric field, linear charge density and electrostatic force.

The electric field is

E = \frac{\lambda}{2\pi \epsilon_0 r}

Here,

\lambda= Linear charge density

\epsilon_0 = Permittivity of free space

r = Distance

The linear charge density can be written as,

Linear charge density is given as

\lambda = \frac{q}{L}

Replacing,

E = \frac{\frac{q}{L}}{2\pi \epsilon_0 r}

E = \frac{q}{2\pi \epsilon_0 rL}

The initial and final electric Force can be written as function of the charge and the electric field as

F_i = E_i q

F_f = E_f q

If we replace the value for the electric field we have,

F_i = (\frac{q}{2\pi \epsilon_0 rL})q = (\frac{q^2}{2\pi \epsilon_0 rL})

Length is one third at the end, then

F_f = (\frac{q}{2\pi \epsilon_0 r(L/3)})q = (\frac{3q^2}{2\pi \epsilon_0 rL})

The ratio of the force is

\frac{F_f}{F_i} = \frac{(\frac{3q^2}{2\pi \epsilon_0 rL})}{(\frac{q^2}{2\pi \epsilon_0 rL})}

\frac{F_f}{F_i} = 3

Therefore the required ratio is 3

7 0
3 years ago
Water behind a dam has a certain amount of stored energy that can be released as the water falls over the top of the dam. It may
Tpy6a [65]

Answer:

The answer is potential energy

Explanation:

The potential energy is the energy possessed by a body by virtue of it position

For example the water at the top of the dam is being held at a height h above the bottom of the dam

Then the potential energy

PE= weight of the water* the height

PE= m*g*h

8 0
4 years ago
1)A plastic rod is rubbed against a wool shirt, thereby acquiring a charge of -0.7 µC. How many electrons are transferred from t
ratelena [41]

Answer:

electrons are transferred from the wool shirt to the plastic rod is  4.375 × 10^{12} electrons

Explanation:

given data

Amount of charge transferred Q = -0.7 μC  = -0.7 × 10^{-6} C

electrons of charge e = -1.6 × 10^{-19} C

solution

we apply formula here for  total charge of electrons that is

Q = n × e   ...................2

here n is no of electron that is

n = \frac{Q}{e}    

put here value

n = \frac{-0.7*10^{-6}}{-1.6*10^{-19}}  

n = 4.375 × 10^{12} electrons

so here electrons are transferred from the wool shirt to the plastic rod is  4.375 × 10^{12} electrons

7 0
3 years ago
A cart moves toward a motion sensor on a track in three different ways: speeding up with constant speed slowing to a stop and tu
devlian [24]

Answer:

Acceleration of the cart in the beginning is positive

Speed is positive when speeding up and slowing down.

Speed is zero when the cart stops.

Speed is negative when the cart speeds up in opposite direction.

Acceleration is negative when speeding up in opposite direction from rest.

Explanation:

When the cart is speeding up then its speed is increasing with time hence its acceleration is having a positive  value.

  • On speeding up the velocity is positive.
  • On gradually decreasing the speed and coming to a stop the velocity is still positive with continuously decreasing magnitude until it reaches zero when the cart stops.
  • When the cart speeds up in the opposite direction then the velocity of the cart becomes negative from zero and continuously increases in the negative value over a span of time hence its acceleration is also negative.

4 0
4 years ago
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