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chubhunter [2.5K]
3 years ago
10

47) Which of the following types of energy is the kind that an object gains when it is raised to a higher point on a

Physics
1 answer:
butalik [34]3 years ago
7 0

Answer:

kinetic

Explanation:

kinetic energy is powered by motion or gravity the steeper the hill is the faster a ball will roll

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Question 8: Unspooling Thread (100 points) A 110 g spool of thread with a 4.2 cm radius is held up by a peg through its center a
Vaselesa [24]

Answer:

   a = 7.29 m / s²,      T = 0.40 N

Explanation:

To solve this exercise we must apply Newton's second law to each body

The needle

              W -T = m a

              mg - T = ma

The spool, which we will approach by a cylinder

             Σ τ = I α

             T R = I α

the moment of inertia of a cylinder with an axis through its center is

             I = ½ M R²

angular and linear variables are related

            a = α R

            α = a / R

we substitute

           T R = (½ M R²) a / R

            T = ½ M a

we write our system of equations together

              mg - T = m a

                      T = ½ M a

we solve

              m g = (m + ½ M) a

              a = \frac{m}{m + \frac{1}{2} M}  \ g

let's calculate

              a = \frac{0.160}{0.160 + \frac{1}{2} 0.110} \ 9.8

              a = 7.29 m / s²

now we can look for the tension

              T = ½ M a

              T = ½ 0.110 7.29

               T = 0.40 N

7 0
3 years ago
How to calculate kinetic energy of a projectile at the highest point of a projectile?
Marianna [84]
Kinetic energy is half the product of the mass and the square velocity and at highest point the velocity is 0 thus the kinetic energy is 0 J
6 0
3 years ago
Read 2 more answers
Two electric motors drive two elevators of equal mass in a three-story building 10 meters tall. each elevator has a mass of 1,00
Licemer1 [7]
<span>The power output is calculated by multiplying the weight of the elevator (1000 kg) by g (9.8 m/s^2) and by the distance (10 m), then dividing the product by the time (10 s). Thus, the power output of the second motor is 9800 watts.</span>
7 0
3 years ago
Read 2 more answers
A 0.45 m radius, 500 turn coil is rotated one-fourth of a revolution in 4.01 ms, originally having its plane perpendicular to a
AysviL [449]

Answer:

B = 0.126 T

Explanation:

As per Faraday's law we know that rate of change in magnetic flux will induce EMF in the coil

So here we can say that EMF induced in the coil is given as

EMF = \frac{\phi_2 - \phi_1}{\Delta t}

initially the coil area is perpendicular to the magnetic field

and after one fourth rotation of coil the area vector of coil will be turned by 90 degree

so we can say

\phi_1 = NBAcos 0 = BA

\phi_2 = NBAcos 90 = 0

now we will have

EMF = \frac{NBA}{t}

10,000 V = \frac{(500)(B)(\pi \times 0.45^2)}{4.01\times 10^{-3}}

B = 0.126 T

3 0
3 years ago
Why can't 41 be represented in a binary table?
Airida [17]

Answer:

I think it is but I don't know for sure

Explanation:

41 101001

41 is 101001 on the binary table i think

8 0
3 years ago
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