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Galina-37 [17]
3 years ago
12

As the car falls off the cliff, what is happening to the kinetic energy of the falling car?

Physics
1 answer:
Airida [17]3 years ago
7 0

Answer:

The kinetic energy is increasing as potential energy is converted.

Explanation:

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A ball rolls off the top of the roof of a building that is 13 meters tall. Calculate the amount of time it takes for it to hit t
kramer

Answer:

The ball takes $t=1 \cdot 917sec$ to hit the ground.

Explanation:

• The second equation of motion represents the total distances travelled by an object in a time interval of $\Delta t$ with an initial speed of $u$ and acceleration $a$.

• To find the time, ball takes to hit the ground, use the formula: $$s = ut + \frac{1}{2}a{t^2}$$

Where, $t$ is time, $u$ is initial velocity, $a$ is acceleration and$s$ is displacement.

• In this case, $a = g = 9 \cdot 8m/se{c^2}$.

• Placing the value of the given initial velocity, $u=0cm/s$ and displacement,$s = 13m$ in the above formula.

& \therefore s = ut + \frac{1}{2}g{t^2}  \\&  \Rightarrow 13 = 0 \cdot t + \frac{1}{2} \times 9 \cdot 8 \times {t^2}  \\

&  \Rightarrow 13 = 4 \cdot 9{t^2}  \\&  \Rightarrow {t^2} = \frac{{13}}{{4.9}}  \\&  \Rightarrow t = 1 \cdot 917sec \\\end{align}\]

• Hence, ball takes $t=1 \cdot 917sec$ to hit the ground.

Learn more about second equation of motion here:

brainly.com/question/19030143

5 0
3 years ago
A train rolls to a stop along a horizontal track without the conductor applying the brakes. What answer choice BEST explains why
Naya [18.7K]

Answer:

B

Explanation:

Friction always eventually stops whatever is in motion.

4 0
3 years ago
A 9.0 kg bowling ball races down the lane at 15 m/s before striking a bowling pin (at rest) with a mass of 0.85 kg. If the 0.85
artcher [175]

Answer:

v = 10.75\,\frac{m}{s}

Explanation:

The system ball-pin is modelled by the Principle of Moment Conservation:

(9\,kg)\cdot (15\,\frac{m}{s} ) + (0.85\,kg)\cdot (0\frac{m}{s} ) = (9\,kg)\cdot v + (0.85\,kg)\cdot (45\,\frac{m}{s} )

The velocity of the bowling ball after the collision is:

v = 10.75\,\frac{m}{s}

8 0
3 years ago
Read 2 more answers
Sphere A has a charge of +2 x 10 to the power of -6 coulomb and is brought into contact with a similar sphere, B which has a cha
Setler [38]
When sphere A and B are brought in contact and separated, charge on each sphere becomes [2x10^-6 + (-4x10^-6)]/ 2 = -1x10^-6 C.

That is, charge is equally separated and is the average of charges on both spheres. The reason behind equal charge on both spheres after separation is, when they are kept in contact, their potential difference becomes same.
7 0
3 years ago
A force F→=(cx-3.00x2)iˆ acts on a particle as the particle moves along an x axis, with F→ in newtons, x in meters, and c a cons
DerKrebs [107]

Answer:

Explanation:

Work done = ∫Fdx

= ∫(cx-3.00x²)   dx

[ c x² / 2 - 3 x³ / 3 ]₀²

= change in kinetic energy

= 11-20

= - 9 J

[ c x² / 2 -  x³   ]₀² = - 9

c x 2² / 2 - 2³ = -9

2c - 8 = -9

2c = -1

c = - 1/2

6 0
3 years ago
Read 2 more answers
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