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zysi [14]
4 years ago
9

Select the correct answer from each drop-down menu.

Physics
2 answers:
astra-53 [7]4 years ago
7 0

Answer:

Cutting down trees instead of growing trees raises levels in the atmosphere, and Using clean energy sources instead of fossil fuels decreases the co2 levels in the atmosphere.

Explanation:

We know that the cutting down of tree and more use of fossil fuels increase the carbon dioxide in atmosphere and we can overcome it by using clean energy sources instead of fossil fuels.

Over [174]4 years ago
3 0

Answer:

Cutting down trees instead of growing trees

and

using clean energy sources instead of fossil fuels.

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ANSWER PLEASE FAST I NEED IT
Deffense [45]

14.0.5 cm 13. wind speed surface area temperature

6 0
3 years ago
In a Rutherford scattering experiment, an alpha particle is accelerated toward a stationary silver nucleus. If the closest appro
lys-0071 [83]

Answer:

Initial Kinetic energy of alpha particle is  9.45x10⁻¹³ J .

Explanation:

The distance at which the initial kinetic energy of the particle is equal to the potential energy is known as closest distance. As it is Rutherford scattering, so it is a coulomb potential energy.

Let K be the initial kinetic energy of alpha particle and r be the closest approach distance. So,

Initial Kinetic Energy = Coulomb Potential Energy

K = \frac{k\times2e\times{Ze}}{r }

Here, k is constant, e is charge of electron and Z is the atomic number of silver.

Put 9x10⁹ N m²/C² for k, 1.6x10⁻¹⁹ C for e, 47 for Z and 22.9x10⁻¹⁵ m for r in the above equation.

K = \frac{9\times10^{9}\times{1.6}\times10^{-19}\times{1.6}\times10^{-19}\times2\times47}{22.9\times10^{-15} }

K = 9.45x10⁻¹³ J

3 0
4 years ago
The greater the force squeezing 2 surfaces together, the smaller the
Dafna11 [192]

Answer:

False

Explanation:

It is false because the greater the force, the greater the friction.

5 0
3 years ago
Read 2 more answers
A typical rechargeable deep-cycle battery for an electric trolling motor (fishing boat) delivers 10A of current at a voltage of
Oksi-84 [34.3K]

Answer:

a) 360 kQ

b) 4.32 MJ

c) 1200 W-h

Explanation:

a) The definition of the current is.

I= \frac{Q}{t}

having a count that 10 hours = 36.000 s

Q = I*t

Q = 36000*10 = 360.000 [Q]

b) The definition of the Energy in power terms is.

E = \int\limits^{t}_{0} {P} \, dt

and the definition of power is:

P = V*I = 12 * 10 = 120 [W]

replacing in the energy formula.

E = \int\limits^{36.000}_{0} {120} \, dt

solving the integral, have into account that t is in seconds.

E=P*t=120*36000=4.320.000=4.32 [MJ]

c) The energy in W-h, we can find it multiplying power by hours

E = P*t =120*10 = 1200 W-h.

3 0
3 years ago
A student stands on the edge of a cliff that is 300 m high and kicks a rock horizontally. 7.8 seconds later, the rock hits the g
mart [117]

Answer:

6.65m/s

Explanation:

Using the equation of motion

S = ut + 1/2gt²

S is the height of fall

t is the time

u is the horizontal velocity

g is the acceleration due to gravity

Given

S = 300 + 50

S = 350m

t = 7.8seconds

g = 9.8m/s^2

Get S

S = 7.8u + 1/2(9.8)(7.8)²

S = 7.8u + 298.116

350 = 7.8u + 298.116

7.8u = 350 - 298.116

7.8u = 51.884

u = 51.884/7.8

u = 6.65m/s

Hence the rock's horizontal velocity was 6.65m/s

6 0
3 years ago
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