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3 years ago

13

The energy source in photosynthesis is a. Light energy. C. Heat energy. B. Chemical energy. D. Kinetic energy. Please select the

best answer from the choices provided A B C D

1 answer:

stira [4]3 years ago

4 0

energy source in photosynthesis is light energy so, choice A is right answer

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Which of these is an example of a chemical change?

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1 - fireworks exploding

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You serve a volleyball with a mass of 0.77 kg. The ball leaves your hand with a velocity of

dimaraw [331]

<h2>Given :</h2>

mass (m) = 0.77 kg

velocity (v) = 2.33 m/s

<h2>Solution :</h2>

$\boxed{ \mathrm{Kinetic \: Energy = \frac{1}{2} m {v}^{2} }}$

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$\dfrac{418.0253}{2}$

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3 years ago

An electron moves through a uniform electric field E = (2.00î + 5.40ĵ) V/m and a uniform magnetic field B = 0.400k T. Determine

EleoNora [17]

Answer: $a=1.75\times 10^{21}\left ( 2\hat{i}5.08\hat{j}\right )$

Explanation:

Given

Electric Field $\vec{E}=2\hat{i}+5.4\hat{j}$

$\vec{B}=0.4\hat{k}\ T$

velocity $\vec{v}=8\hat{i} m/s$

mass of electron $m=9.1\times 10^{-31} kg$

Force on a charge Particle moving in Magnetic Field

$F=e\left [ \vec{E}+\left ( \vec{v}\times \vec{B}\right )\right ]$

$a=\frac{e\left [ \vec{E}+\left ( \vec{v}\times \vec{B}\right )\right ]}{m}$

$a=\frac{1.6\times 10^{-19}\left [ 2\hat{i}+5.4\hat{j}+\left ( 8\hat{i}\times 0.4\hat{k}\right )\right ]}{9.1\times 10^{-31}}$

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3 years ago

A roller coaster moving down a hill is an example of what kind of energy

GalinKa [24]

That would be kinetic energy

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3 years ago

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A mass of 0.40 kg is suspended on a spring which then stretches 10 cm. The mass is then removed and a second mass is placed on t

Vanyuwa [196]

Answer:

x' = 1.01 m

Explanation:

given,

mass suspended on the spring, m = 0.40 Kg

stretches to distance, x = 10 cm = 0. 1 m

now,

we know

m g = k x

where k is spring constant

0.4 x 9.8 = k x 0.1

k = 39.2 N/m

now, when second mass is attached to the spring work is equal to 20 J

work done by the spring is equal to

$W = \dfrac{1}{2}kx'^2$

$20= \dfrac{1}{2}\times 39.2\times x'^2$

x'² = 1.0204

x' = 1.01 m

hence, the spring is stretched to 1.01 m from the second mass.

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3 years ago