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Len [333]
3 years ago
5

I really dont know physics

Physics
1 answer:
antiseptic1488 [7]3 years ago
4 0

Answer:

3

Explanation:

I had this question before

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How long would it take for a rock falling 97.2 m/s to reach the ground from 100 meters
mote1985 [20]

Answer;

velocity(v) = 97.2 m/s ,

distance (S) = 100 m

determine time(t) = ?

  We know that,

               distance (S) = velocity(v) × time(t)

           So,      time (t) = distance ÷ velocity

                                   = 100 ÷ 97.2

                              <em>   t = 1.02 sec.</em>

<em>I hope this will help you.</em>

5 0
4 years ago
You drop a 30 g pebble down a well. You hear a splash 2.7 s later. Ignoring air resistance, how deep is the well? Assume g = 9.8
julia-pushkina [17]
Here, you need to apply second equation of Kinematics
S = ut + 1/2 at²
s = at²/2  [ As initial velocity (u) = 0 ]

Now, a = 9.8 m/s²
t = 2.7 s

Substitute their values in the formula:
s = 9.8 × (2.7)² / 2
s = 35.721 m

After rounding-off to the nearest hundredth value, it would be 36 m

Finally, your answer would be option B.

Hope this helps!
3 0
3 years ago
A deer is running from a mountain lion when it encounters a fence that is 1.50 m high. Seeing the fence, the deer jumps, leaving
Novosadov [1.4K]

Answer:

Explanation:

Given

Initial Velocity (u)=13 m/s

angle=29^{\circ}

distance between fence and deer=2.5 m

We consider deer jump similar to projectile motion

equation of trajectory

y=xtan\theta -\frac{gx^2}{2u^2(cos\theta )^2}

y=2.5tan(29)-\frac{9.8\times 2.5^2}{2\times 13^2\times (cos29)^2}

y=1.385-0.2368=1.148 m

Thus deer will cross the fence with an difference in its jump and fence

1.5-1.148=0.351 m

h_{max}=\frac{u^2sin^2\theta }{2g}

h_{max}=\frac{13^2\times (sin29)^2}{2\times 9.8}

h_{max}=2.02 m

so deer rises during when it is over fence

8 0
4 years ago
Convert 9.2 km to m​
Nataly_w [17]

Answer:

9,200 m

Explanation:

1 kilometer = 1000 meters so if there is 9 kilometers then it is 9000 meters, then .2 kilometer is equal to 200 meters. Add the numbers together to get 9,200 meters

5 0
4 years ago
Which will speed up a chemical reaction? Apply heat. Increase the concentration of the reactants. Grind up the substance, so the
makkiz [27]
All of the above options are correct
8 0
3 years ago
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