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Mila [183]
3 years ago
12

A model rocket is shot directly upward, rises to its maximum height and then returns to its launch position in 10.0 s. Assuming

free fall conditions, what was the rocket's initial upward velocity?
a. 98.0 m/s
b. 123 m/s
c. 24.5 m/s
d. 49.0 m/s
Physics
1 answer:
worty [1.4K]3 years ago
3 0

d. 49.0 m/s

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Lightning flashes one mile (1609 m) away from you. How much time does it take the light to travel that distance?
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Answer:

t=5.36\times 10^{-6}\ s

Explanation:

Given that,

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speed = distance/time

t=\dfrac{d}{v}\\\\t=\dfrac{1609}{3\cdot10^{8}}\\\\=5.36\times 10^{-6}\ s

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2 years ago
You can increase the capacitance of a capacitor by A. Decreasing the plate spacing B. Increasing the plate spacing. ° C. Decreas
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You can increase the capacitance of a capacitor by decreasing the plate spacing (A) or by increasing the area of the plates (D).

'A' and 'D' both do the job, so the correct choice is<em> (E)</em> .

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A solenoid of length 5.0 cm has a cross sectional area of 1.0 cm2 and has 300 uniformly spaced turns. The solenoid is wrapped in
OleMash [197]

The calculated mutual inductance is 8.544 x 10⁻⁵ H.

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Length of the solenoid= 5.0 cm

Area of cross-section=1.0 cm²

no of spaced turns=300 turns

turns of insulated wire=180 turns

Mutual inductance (M) = μ₀μr N1N2 A/ L

                                     =(4xπx 10⁻⁷) x (6.3 x 10⁻³) x 300 x 180 x 1/ 5

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hence, the mutual inductance is 8.544 x 10⁻⁵ H.

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4 0
1 year ago
A ball is projected upward at time t = 0.0 s, from a point on a roof 70 m above the ground. The ball rises, then falls and strik
pentagon [3]

Answer:

The velocity of a ball will be "-70.13 m/s".

Explanation:

The given values are:

u = 70 m

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s = -1 m

v = ?

As we know,

The equation of motion will be:

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On substituting the estimated values, we get

⇒  v^2-(70)^2=2\times (-9.8)\times (-1)

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⇒  v^2=19.6+4900

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⇒  v=\sqrt{4919.6}

⇒  v=70.13 \ m/s

In downward direction, it will be:

⇒  v=-70.13 \ m/s

8 0
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