a car goes from a velocity zero to a velocity of 15 meters per second East in 2.1 seconds. What is the car's acceleration?

A type of friction that occurs when air pushes against a moving object causing it to negatively accelerate

Romashka [77]

Answer:

Air resistance

Answer B is correct

Explanation:

The friction that occurs when air pushes against a moving object causing it to negatively accelerate is called as air resistance.

hope this helps

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6 0

2 years ago

Carol drops a stone in a mine shaft 122.5 metres deep.How

Verizon [17]

Answer:

T = 5.36 s

Explanation:

given,

depth of the mine shaft = 122.5 m

speed of the sound = 340 m/s

time taken = ?

time taken by the stone to reach at the bottom

using equation of motion

$s = u t + \dfrac{1}{2}gt^2$

initial speed , u = 0 m/s

$t = \sqrt{\dfrac{2s}{g}}$

$t = \sqrt{\dfrac{2\times 122.5}{9.8}}$

t = 5 s

time taken by the sound to travel

d =v x t

$t = \dfrac{d}{v}$

$t = \dfrac{122.5}{340}$

t = 0.36 s

total time taken for the sound to reach carol after dropping the stone

T = 5 + 0.36

T = 5.36 s

7 0

2 years ago

The quantum mechanical approach to atomic structure permits the calculation of 1. the most probable distance between any two spe

miss Akunina [59]

Answer:

2. a region about the nucleus in which an electron of specified energy will probably be found

Explanation:

With quantum mechanics we can find the wave function that describes the movement of the particles, the interpretation of this wave function is through the probability density (φ* φ).

This probabilistic interpretation of the energies, position and amounts of motion electrons allow us to find the region around the nucleus where an electron of specific energy can be found with a given probability.

The correct answer is 2

3 0

2 years ago

The weight of an object _____.

denis23 [38]

The weight of an object is the force with which it is attracted to earth. The gravity of an object or body of an object is high on earth than at the atmosphere. It has an average of gravitational constant equal to 9.8066 or 9.8 meters per second. In truth, the acceleration of the object depend upon its location, the latitude and altitude, on earth.

8 0

2 years ago

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Jumper cables used to start a stalled vehicle often carry a 65 a current. how strong is the magnetic field 12 cm from one cable?

FromTheMoon [43]

The magnetic field generated by a wire that carries a current of intensity I is :
$B= \frac{\mu _0 I}{2 \pi r}$
where
$\mu_0 = 4 \pi \cdot 10^{-7} T m A^{-1}$ is the magnetic permittivity
I is the current
r is the radial distance from the wire at which the field is calculated.

In our problem, I=65 A and r=12 cm=0.12 m, so the magnetic field is:
$B= \frac{(4 \pi \cdot 10^{-7} T m A^{-1})(65 A)}{(2 \pi)(0.12 m)}=1.1 \cdot 10^{-4} T$

And we can see that the intensity of this magnetic field at r=12 cm is approximately twice the intensity of the Earth's magnetic field ( $5.5 \cdot 10^{-5}T$ )

7 0

2 years ago

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