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3 years ago

If an object is not accelerating, it can exist in what 2 other states of motion?

Physics

1 answer:

dezoksy [38]3 years ago

7 0

Answer:

Friction is a force that acts in a direction opposite to the motion of the moving object.

Friction will cause a moving object to slow down and finally stop.

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a. How many excess electrons must be distributed uniformly within the volume of an isolated plastic sphere 25.0 cm in diameter t

Agata [3.3K]

Answer:

Explanation:

The electric field outside the sphere is given as,

E = k Q /r²

here Q = n x 1.6 x 10⁻¹⁹ C

where n is the number of electons

if the dimeter of sphere d= 25 cm= 0.25 m

then the radius r = 0.125 m

we get

n= E r²/ k x 1.6 x 10⁻¹⁹ C

n = 1350N/C x (0.125m)² / (8.99 x 10⁹ N m²/C² x 1.6 x 10⁻¹⁹ C)

n = 14664731646

5 0

2 years ago

Which metal works best to displace hydrogens from acid?

egoroff_w [7]

Lead is answer i think

5 0

2 years ago

A football is kicked from ground level at an angle of 38 degrees. It reaches a maximum height of 9.7 meters before returning to

dem82 [27]

Answer:

Football will be in air for 2.8139 sec

Explanation:

We have given maximum height h = 9.7 meters

Angle of projection $\Theta =38^{\circ}$

We know that maximum height is given by $h=\frac{u^2sin^2\Theta }{2g}$

So $9.7=\frac{u^2sin^{2}38^{\circ} }{2\times 9.8}$

$u^2=501.5842$

u = 22.396 m/sec

Time of flight is given by

$T=\frac{2usin\Theta }{g}=\frac{2\times 22.396\times \times sin38^{\circ}}{9.8}=2.8139sec$

5 0

2 years ago

Which two statements are true about energy transformations?

Ghella [55]

Energy is never created and energy never is destroyed

5 0

2 years ago

Read 2 more answers

What speed would a fly with a mass of 0.638 g need in order to have 74354.5 j of kinetic energy

zlopas [31]

Answer:

Explanation:

<u>Kinetic Energy </u>

Is the type of energy of an object due to its state of motion. It's proportional to the square of the speed.

The formula to calculate the kinetic energy is:

$\displaystyle K=\frac{1}{2}mv^2$

Where:

m = mass

v = speed

The kinetic energy is often expressed in Joules (J)

We are given the mass of a fly m=0.638 g and we need to calculate its speed in order to have a kinetic energy of 74354.5 J.

Converting:

m=0.638 g /1000 = 0.000638 kg

To find the speed, we solve the formula for v:

$\displaystyle v=\sqrt{\frac{2K}{m}}$

Substituting:

$\displaystyle v=\sqrt{\frac{2*74354.5}{0.000638}}$

v = 15,267 m/s

(The fly should move faster than a rocket)

7 0

2 years ago