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3 years ago

Identify characteristics of energy from the Sun. Check all that apply.

Physics

2 answers:

Vilka [71]3 years ago

8 0

Answer:

1.Almost all of the energy on Earth comes from the Sun

2.The energy in fossil fuels originally came from the Sun

3.Plants convert the energy of sunlight into chemical energy

Explanation:

xxMikexx [17]3 years ago

6 0

Answer:

First one, third one, and fourth one

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Density is given in ____.<br> a. Pa/cm3<br> c. g/s2<br> b. N/m2<br> d. g/cm3

Ainat [17]

Density is defined as [mass] / [volume] .

The only choice listed with those physical dimensions is 'd' .

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4 years ago

Select the correct answer

Rasek [7]

Answer:

I would say the net force acting on the car is in the opposite direction of the car's motion is correct

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3 years ago

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A 50-kg toboggan is coasting on level snow. As it passes beneath a bridge, a 20-kg parcel is dropped straight down and lands in

timama [110]

Answer:

$KE2/KE1=0.71$

Explanation:

By conservation of the linear momentum:

m1*V1 = (m1+m2)*V2

Solving for V2:

$V2 = \frac{m1}{m1+m2}*V1$

The kinetic energies are:

$KE1=1/2*m1*V1^2$

$KE2 = 1/2*(m1+m2)*V2^2$

$KE2 = 1/2*(m1+m2)*(\frac{m1}{m1+m2}*V1)^2$

Simplifying:

$KE2 = 1/2*\frac{m1^2}{m1+m2}*V1^2$

The ratio will be:

$KE2/KE1=\frac{1/2*\frac{m1^2}{m1+m2}*V1^2}{1/2*m1*V1^2} =\frac{m1}{m1+m2}$

$KE2/KE1=0.71$

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3 years ago

Through what angle in degrees does a 33 rpm vinyl record turn in 0.23 s : A) 46° B) 26° C) 53° D) 33°

solniwko [45]

Answer:

(a) angle record will be 46°

Explanation:

We have given speed = 33 rpm

Time t = 0.23 sec

We know that 1 revolution = 360°

And 1 minute = 60 sec

So 33 revolution/minute $\frac{33\times 360}{60}=198^{\circ}/sec$

So angle record by vinyl $=198\times 0.23=45.54^{\circ}$ , which is nearly equal to 46

So angle record by vinyl is 46°

So option (a) will be the correct answer

5 0

3 years ago

Two long, straight wires are parallel and 16 cm apart. One carries a current of 2.9 A, the other a current of 5.7 A. (a) If the

Mnenie [13.5K]

Explanation:

Given that,

Distance between two long wires, d = 16 cm = 0.16 m

Current in one wire, $I_1=2.9\ A$

Current in wire 2, $I_2=5.7\ A$

The magnetic force per unit length of one wire on the other is given by the following expression as :

$\dfrac{F}{l}=\dfrac{\mu_o I_1I_2}{2\pi d}$

$\dfrac{F}{l}=\dfrac{4\pi \times 10^{-7}\times 2.9\times 5.7}{2\pi \times 0.16}$

$\dfrac{F}{l}=2.06\times 10^{-5}\ N/m$

The current is flowing in opposite direction, the magnetic force acting on it is repulsive. Hence, this is the required solution.

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4 years ago