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Irina18 [472]
2 years ago
11

A projectile is fired directly upward from the ground with an initial velocity of 112 f/sec its distance s above the ground afte

r t seconds is given by s(t)=112t-16t^2 At what time, in seconds, does the projectile achieve its maximum height?
Physics
1 answer:
Travka [436]2 years ago
7 0

Answer:

3.48 seconds

Explanation:

At maximum height Vf=0 m/s

Vf= Vi - g*t

⇒g*t= Vi

⇒t= Vi/g

⇒t= 112/32.17 sec

⇒ t= 3.48 s

so the projectile will achieve its maximum height in 3.48 seconds.

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In a lab, a student drags a shoe across the floor at constant speed. If the coefficient of static friction between the floor and
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<span>B) 0.6 N
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2 years ago
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A 2.00 kg box slides on a rough, horizontal surface, hits a spring with a speed of 1.90 m/s and compresses it a distance of 10.0
oksian1 [2.3K]

Answer:

Explanation:

Given

mass of box m=2\ kg

speed of box v=1.9\ m/s

distance moved by the box x=10\ cm

coefficient of kinetic friction \mu _k=0.66

Friction  force f_r=\mu_kN

f_r=0.66\times mg

f_r=0.66\times 2\times 9.8=12.936 \N

Kinetic Energy of box will be utilize to overcome friction and rest is stored in spring in the form of elastic potential energy

\frac{1}{2}mv^2=f_r\cdot x+\frac{1}{2}kx^2

\frac{1}{2}\times 2\times 1.9^2=12.936\times 0.1+\frac{1}{2}\times k\times (0.1)^2

3.61-1.2936=0.005\times k

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2 years ago
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People often use simple machines like pulleys, levers, and ramps because they say the machine “makes the work easier.” Which of
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I think the answer is D.
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The magnetic field produced by a long straight current-carrying wire is
alexdok [17]

Answer:

proportional to the current in the wire and inversely proportional to the distance from the wire.

Explanation:

The magnetic field produced by a long, straight current-carrying wire is given by:

B=\frac{\mu_0 I}{2 \pi r}

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\mu_0 is the vacuum permeability

I is the current intensity in the wire

r is the distance from the wire

From the formula, we notice that:

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Therefore, correct option is

proportional to the current in the wire and inversely proportional to the distance from the wire.

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