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Anvisha [2.4K]
3 years ago
14

A ball is thrown straight up with an initial speed of 30 m/s. How long will it take to reach the top of its trajectory, and high

will the ball go?
Physics
1 answer:
stiv31 [10]3 years ago
8 0

Answer:

About 3.06 seconds

Explanation:

v_f=v_o+at

Since at the peak of its trajectory, the ball will have no velocity, you can write the following equation:

0=30+(-9.81)t\\\\-30=-9.81t\\\\t\approx 3.06s

Hope this helps!

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Protons are the smallest particle of an element that retains the original Characteristics of the element. True or False
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False; that’s an atom

Explanation:

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How many oxygen atoms are in the following compound?<br> 8 C120
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A satellite is launched to orbit the Earth at an altitude of 3.25 107 m for use in the Global Positioning System (GPS). Take the
Korolek [52]

Answer:Orbital period =21.22hrs

Explanation:

given that

mass of earth M = 5.97 x 10^24 kg

radius of a satellite's orbit, R=  earth's radius + height of the satellite

6.38X 10^6 +  3.25 X10^7 m =3.89 X 10^7m

Speed of satellite, v= \sqrt GM/R

where G = 6.673 x 10-11 N m2/kg2

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V =10,241082.2

v= 3,200.2m/s

a) Orbital period

\sqrt GM/R = \frac{2\pi r}{T}

V= \frac{2\pi r}{T}

T= 2 \pi r/ V

= 2 X 3.142 X 3.89 X 10^7m/ 3,200.2m/s

=76,385.1 s

60 sec= 1min

60mins = 1hr

76,385.1s =hr

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3 0
3 years ago
Earth's magnetic field is approximately 1/2 gauss, that is 50 micro-tesla because the SI field unit of a tesla is 10,000 gauss.
jek_recluse [69]

Answer:

F = 0

Explanation:

The magnetic force is described by two expressions

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for a wire with a current

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bold indicates vectors

let's write this equation in module form

         F = I L B sin θ

where the angle is between the direction of the current and the direction of the magnetic field

In this case they indicate that the cable goes from the South wall to the North wall, so this is the direction of the current

The magnetic field of the Earth goes from the south to the north and in this part it is horizontal

Therefore the current and the magnetic field are parallel, the angle between them is zero

           sin 0 = 0

consequently the magnetic force is zero

            F = 0

5 0
3 years ago
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