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MArishka [77]
4 years ago
7

Select the correct answer.

Physics
2 answers:
Marrrta [24]4 years ago
5 0

Answer:

Matthew should use the safety glasses as his PPE.

Explanation:

nekit [7.7K]4 years ago
5 0
The answer is E. safety glasses
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David is driving a steady 26.0 m/s when he passes tina, who is sitting in her car at rest. tina begins to accelerate at a steady
nata0808 [166]

Relative speed of Tina with respect to David is given by

v_r = v_t - v_d

v_r = 0 - 26

v_r = - 26 m/s

now the acceleration of Tina with respect to David

a_r = a_t - a_d

a_r = 2.80 - 0

a_r = 2.80 m/s^2

now the relative displacement would be zero when Tina cross David

so now we have

\deta x = 0 = v_r * t + \frac{1}{2} a_r t^2

0 = -26 * t + \frac{1}{2}*2.8*t^2

t = 18.6 s

now the speed of Tina at this moment is given as

v_f = v_i + a * t

v_f = 0 + 2.8 * 18.6

v_f = 52 m/s

<em>so the speed will be 52 m/s</em>

5 0
3 years ago
A football is kicked from a tee at 12 m/s at 72° above the horizontal. What is the maximum height of the football
ale4655 [162]
The maximum height is reached when the vertical component of the velocity is zero.

vertical direction:
acceleration: a = -g = -9.81m/s²
velocity: v = -g*t + v₀
position: y = -0.5*g*t² + v₀*t + y₀

For v= 0:
0 = -g*t + v₀ => t = v₀/g 
Insert into position equation gives:
y(max) = (-0.5*v₀²/g) + (v₀²/g) + y₀ = (0.5*v₀²/g) + y₀

6 0
4 years ago
The escape speed from a very small asteroid is only 24 m/s. If you throw a rock away from the asteroid at a speed of 30 m/s, wha
svp [43]

Given Information:  

Initial speed of rock = vi = 30 m/s  

escape speed of the asteroid = ve = 24 m/s  

Required Information:  

final speed of rock = vf = ?

Answer:  

vf = 18 m/s

Explanation:  

As we know from the conservation of energy

KEf + Uf = KEi + Ui

Where KE is the kinetic energy and U is the potential energy

0 + 0 = ½mve² - GMm/R

When escape speed is used, KEf is zero due to vf being zero. Uf is zero because the object is very far away from mass M, therefore, the equation becomes

GMm/R = ½mve²

m cancels out

GM/R = ½ve²

GM/R = ½(24)²

GM/R = 288

KEf + Uf = KEi + Ui

½mvi² + 0 =  ½vf² - GMm/R

m cancels out

½vi² =  ½vf² - GM/R

Substitute the values

½(30)² =  ½vf² - (288)

½vf² = 450 - 288

vf² = 2(162)

vf = √324

vf = 18 m/s

Therefore, the final speed of the rock is 18 m/s

8 0
4 years ago
Read 2 more answers
Calculate the volume that 42g of nitrogen gas (N2)occupies at standard temperature and pressure.​
luda_lava [24]

Nitrogen gas has a molar mass of about 28.0134 g/mol. Then we have a starting amount of

(42 g) / (28.0134 g/mol) ≈ 1.4993 mol

of N₂.

At standard temperature and pressure, one mole of an ideal gas occupies a volume of about 22.4 L. Then 42 g, or 1.4993 mol, of N₂ takes up

(1.4993 mol) × (22.4 L/mol) ≈ 33.6 L

8 0
3 years ago
The most likely theory of the formation of Earth's Moon is that it The most likely theory of the formation of Earth's Moon is th
Ann [662]

Answer:

Option (3)

Explanation:

According to researches done by the astronomers, it has been found that the earth collided with a giant Mars-size early proto-planet, whose name was 'Theia' during the Hadean era, about.5 billion years back. This collision resulted in the detachment of a considerably huge amount of material away from the earth. The remnant debris particles accumulated and gave rise to the formation of moon. The earth during that time was comprised of molten lava only, and from this collision, the earth attained its tilt of approximately 23.5°.

Thus, the correct answer is option (3).

4 0
4 years ago
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