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2 years ago

Muscles convert chemical energy into A) light energy. B) nuclear energy. C) mechanical energy. D) electromagnetic energy.

Physics

2 answers:

hoa [83]2 years ago

7 0

The muscles convert the stored chemical energy into mechanical energy

pshichka [43]2 years ago

3 0

Answer:

The correct answer would be C) mechanical energy.

The muscles harness the energy from the food that is, the chemical energy and convert it into the ATP (adenosine triphosphate) which is also a chemical energy.

The ATP are then used by the muscles as the source of energy for the movements such as locomotion that is, mechanical energy.

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A satellite is revolving the earth 4km above the surface.find the orbital velocity of the satellite (R =6400km,g=9.8m/s^2)

Karo-lina-s [1.5K]

Answer:

v ≈ 7900 m/s

Explanation:

centripetal force will equal gravity force

mv²/R = mg

v²/R = g

v² = Rg

v = √(Rg)

v = √(6.4e6(9.8))

v = 7.91959...e+3

v ≈ 7900 m/s

of course, at those velocities and that deep into the atmosphere, the satellite would quickly burn up, slow down, and cause tremendous damage to buildings etc. with the sonic boom shock wave. It would also have to avoid a lot of mountains as 4000 m is not that high.

3 0

2 years ago

Why is accuracy important in dodgeball?

____ [38]

Accuracy and power are the only things that matter in dodge ball. If you are not accurate, then your target does not get hit.

8 0

2 years ago

What is happening to the water molecules as it changes from ice to liquid water? *

g100num [7]

Answer:

They are gaining energy, can move and slide past each other.

Explanation:

Because as ice melts, the molocules gain energy/heat which warm them up and are able to slide/move apart from each other.

7 0

2 years ago

A 0.260 m radius, 525 turn coil is rotated one-fourth of a revolution in 4.17 ms, originally having its plane perpendicular to a

Sophie [7]

Answer:

B = 0.37T

Explanation:

In order to calculate the needed magnitude of the magnetic force you use the following formula, which calculate the induced emf of the solenoid when there is a change in the magnetic flux:

$emf=-N\frac{\Delta \Phi_B}{\Delta t}=-N\frac{\Delta (BAcos\theta)}{\Delta t}$ (1)

emf: induced voltage in the solenoid = 10,000V

N: turns of the solenoid = 525

ФB: magnetic flux

B: magnitude of the magnetic field = ?

A: cross-sectional area of the solenoid = π*r^2

r: radius of the cross-sectional area = 0.260m

Δt: interval time of the change of the magnetic flux = 4.17ms = 4.17*10^-3s

First, you have the magnetic field direction perpendicular to the plane of the solenoid, after, the angle between them is 90° (quarter of a revolution)

In the equation (1) the only parameter that changes on time is the angle, then, you can solve for B from the equation (1):

$emf=-NBA\frac{cos(90\°)-cos(0\°)}{\Delta t}=\frac{NBA}{\Delta t}\\\\B=\frac{(\Delta t)(emf)}{NA}=\frac{(\Delta t)(emf)}{N(\pi r^2)}\\\\$

Finally, you replace the values of the parameters to calculate B:

$B=\frac{(4.17*10^{-3}s)(10000V)}{(525)(\pi(0.260m)^2)}=0.37T$

The strength of the magnetic field is 0.37T

7 0

2 years ago

What is the force of gravity between two 3.0 kg masses 1.0 m apart?

gavmur [86]

m₁ = mass of the first object = 3.0 kg

m₂ = mass of the second object = 3.0 kg

r = distance between the first and second object = 1.0 m

G = universal gravitational constant = 6.67 x 10⁻¹¹ N m²/kg²

F = force of gravity between the two objects = ?

according to law of gravitation, force of attraction "F" between two objects m₁ and m₂, placed distance "r" apart is given as

F = G m₁ m₂/r²

inserting the values

F = (6.67 x 10⁻¹¹) (3.0) (3.0)/(1.0)²

F = (6.67 x 10⁻¹¹) (9.0)

F = 60.03 x 10⁻¹¹ N

F = 6.003 x 10⁻¹⁰ N

6 0

2 years ago