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liq [111]
3 years ago
11

The Sun is the main source responsible for heating the surface of the Earth. Is this true or false? Give reasons to support your

position.
Physics
1 answer:
notsponge [240]3 years ago
3 0
Yes its true, because most energy is coming from the Sun. Other sources of energy on Earth are Earth internal energy and cosmic radiation but they infuluence much less the temperature of the surface of the Earth compared to the Sun.
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A fisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. It takes 3.1 s
aleksandrvk [35]

Answer:

Explanation:

It takes 3.1 s for the boat to travel from its highest point to its lowest, so the period of oscillation

T = 2 x 3.1 = 6.2 s

frequency of wave n = 1 / T = .1613 per sec

Amplitude of oscillation = .55/2 = .275 mm

The fisherman sees that the wave crests are spaced 4.2 mm apart. so wavelength of wave λ = 4.2 mm .

A ) velocity of wave v = n λ

.1613 x 4.2 = .677 mm /s

B ) Amplitude of wave = .275 mm

C ) The vertical distance determines only the amplitude which does not affect the velocity , so velocity will remain unchanged .

D ) Amplitude of wave depends only on the vertical displacement .

The amplitude will become .5 / 2 = .25 mm .

8 0
3 years ago
g Suppose that the Red cart has a mass of 500 grams, and the blue cart has a mass of 250 grams, and they are connected with a sp
Neko [114]

Answer:

19.2 N

Explanation:

After any transients dissipate, all forces must balance. The red cart never moves.

5 0
3 years ago
Extra-solar planets are probably composed of which gases?
kifflom [539]
Exoplanets are probably 
<span>made of hydrogen and helium </span>gas<span>. ... </span>
5 0
4 years ago
zanele has a mass of 40kg and is sitting inside a 20kg cart .zanele's friends pull a cart with a force of 500N at an angle of 20
Dmitriy789 [7]

The net horizontal force acting on the cart is 169.85 N.

The change in the carts momentum is 5,000 Ns.

The net horizontal force on Zanele is same as the net horizontal force on the cart.

If angle between the 500N force and the horizontal is decreased, the final velocity of the cart increases.

The given parameters:

  • Mass of zanele, m1 = 40 kg
  • Mass of the cart, m2 = 20 kg
  • Applied force, F = 500 N, at angle 20 degrees
  • Frictional force on the cart, Ff = 300 N
  • Time, t = 10 s

<h3>Net horizontal force on the cart;</h3>
  • The net horizontal force acting on the cart is calculated as follows;

F_{net} = F - F_f\\\\F_{net} = 500 \times cos(20) - 300\\\\F_{net} = 169.85 \ N

<h3>Change in momentum;</h3>
  • The change in the carts momentum at the given time of applied force is calculated as follows;

\Delta mv = Ft  \\\\\Delta mv = 500 \times 10= 5,000 \ Ns

The net horizontal force on Zanele is same as the net horizontal force on the cart.

<h3>The final velocity of the cart;</h3>
  • When the angle decreases the cart's final velocity would be affected  as follows;

F_{net} = F - F_f\\\\F_{net} = \frac{mv}{t} \\\\\frac{mv}{t} =  F - F_f\\\\  \frac{mv}{t} =  Fcos(\theta) - F_f\\\\let \ \theta  = 0^0\\\\\frac{mv}{t} =500 \times cos(0) - 300\\\\\frac{mv}{t} = 200\\\\v = \frac{200 t}{m} \\\\when \ \theta = 20^0\\\\\frac{mv}{t} =500 \times cos(20) - 300\\\\\frac{mv}{t} = 169.85\\\\v = \frac{169.85t}{m}

Thus, if angle between the 500N force and the horizontal is decreased, the final velocity of the cart increases.

Learn more about net horizontal force here: brainly.com/question/21684583

5 0
3 years ago
Yellow-green light has a wavelength of 560 nm. What is its frequency?
Natasha2012 [34]
5.4 x 1014Hz
wavelength x frequency = the speed of light
7 0
3 years ago
Read 2 more answers
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