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2 years ago

The problem with your knees being over your toes is _______.

Physics

1 answer:

FrozenT [24]2 years ago

7 0

Answer:

D. All of the above

Explanation:

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A man jumps horizontally from the top of a building that is 20.0m high, and hopes to reach a swimming pool that is at the bottom

Oliga [24]

Answer:

5 m/s

Explanation:

Given that the hight of the building, h= 20.0 m

The horizontal distance of the swimming pool from the building, d=10 m

As the man jumps horizontally, so the vertical velocity at the time of jumping is 0.

Let s be the initial horizontal velocity of the man at the time of jumping.

As the gravitational force always acts in the vertical direction, so, it does not change the horizontal speed.

So, the horizontal velocity, s, remains constant throughout the motion.

If t be the time of flight, then $s=10/t \cdots(i)$

Now, applying the equation of motion in the vertical direction,

$s=ut+\frac 1 2 at^2$

where u is the initial velocity, t is the time of flight, a is the acceleration, s is the displacement.

Here, putting s= 20 m, u=0, $a=g=9.81 m/s^2$ in the equation of motion, we have

$20=0\timest+\frac 1 2 (9.81)t^2 \\\\\Rightarrow 20 = \frac 1 2 (9.81)t^2 \\\\\Rightarrow t^2 = (20\times2)/9.81 \\\\$

$\Rightarrow t = 2$ seconds (approx)

Now, put t=2 in the equation ( we have

$s=10/2=5$ m/s

Hence, the man must jump with 5 m/s horizontally to reach the pool.

6 0

3 years ago

A scientific blank must be testable and capable of being proven false?

coldgirl [10]

Answer: a scientific theory must be testable and capable of being proven false.

4 0

4 years ago

How does the mass and size of a dwarf star compare with mass and size of the sun

Murljashka [212]

Das is from my star nerd bro schwarzschildradius

our sun is actually a dwarf star
some dwarf stars are larger than our sun
some dwarf stars are smaller than our sun

so there is actually no differnce between the sun an a dwarf star

5 0

3 years ago

Light-rail passenger trains that provide transportation within and between cities are capable of modest accelerations. The magni

Mkey [24]

During the first phase of acceleration we have:
v o = 4 m/s; t = 8 s; v = 13 m/s, a = ?
v = v o + a * t
13 m/s = 4 m / s + a * 8 s
a * 8 s = 9 m/s
a = 9 m/s : 8 s
a = 1.125 m/s²
The final speed:
v = ?; v o = 13 m/s; a = 1.125 m/s² ; t = 16 s
v = v o + a * t
v = 13 m/s + 1.125 m/s² * 16 s
v = 13 m/s + 18 m/s = 31 m/s

3 0

3 years ago

Newton's third law says that for every force there is an equal reaction force in the opposite direction. what does this imply ab

stealth61 [152]

This imply that the force applied by the gravity of the earth on the person, is equal to the force applied by the person on the earth.

According to the Newton's third law, for every force there is an equal reaction force, in the case of person standing on the earth, the gravity of the earth pulls the person by the same magnitude as the force applied by the person on the earth (which is equal to the weight of the person)..

7 0

3 years ago