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2 years ago

13

A projectile is launched from ground level at an angle of 50.0 degrees above the horizontal with a speed of 30.0 m/s. If the pro

jectile is moving over level ground, how long is it in the air before it again contacts the ground

1 answer:

Allushta [10]2 years ago

6 0

Answer:

4.69 s

Explanation:

u = Initial velocity = 30 m/s

$\theta$ = Angle of launch = $50^{\circ}$

g = Acceleration due to gravity = $9.81\ \text{m/s}^2$

Time taken by the projectile to land is given by

$t=\dfrac{2u\sin\theta}{g}\\\Rightarrow t=\dfrac{2\times 30\times \sin50^{\circ}}{9.81}\\\Rightarrow t=4.69\ \text{s}$

The time the projectile is in the air before it contacts the ground again is 4.69 s.

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2 years ago

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61. A physics student has a single-occupancy dorm room. The student has a small refrigerator that runs with a current of 3.00 A

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Answer:

Part a)

$percentage = 21.3$ %

Part b)

$percentage = 2.13 \times 10^{-5}$ %

Explanation:

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Part a)

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$P = i^2 R$

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$percentage = \frac{loss}{supply} \times 100$

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Part b)

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