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tensa zangetsu [6.8K]
3 years ago
7

2. Two people, one on Earth and the other on the Moon, try and lift 200 kg blocks. Which person

Physics
1 answer:
Art [367]3 years ago
6 0

Answer:

The person on Earth will have to exert more force to lift their block

Explanation:

The mass of the blocks to be lifted = 200 kg

The location of the first person = On Earth

The location of the second person = On the Moon

The force a person will have to exert to lift the block = The weight of the block = The gravitational force, F, on the block which is given as follows;

F = \dfrac{G \times M_1}{R^2}  \times m_2

Where;

\dfrac{G \times M_1}{R^2}= The acceleration due to gravity on the Earth or the Moon, depending on the location of the block

m₂ = The mass of the block

Therefore, given that the acceleration due to gravity on the Earth is larger than the acceleration due to gravity on the Moon, the weight of the block on the Earth is larger than the weight of the block on the Moon, and the person on Earth have to exert more force to lift the heavier weight of the block on Earth than the person on the Moon will have to exert to lift the same block as the block has a lower weight on the Moon due to lower acceleration due to gravity on the Moon.

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If we decrease the amount of force applied to an object, and all other factors remain the same, the amount of work completed wil
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A ) decrease.
B ) increase.
C ) increase, then decrease.
D ) not change.

The answer is A) decrease

Take pushing a box, for example-- You  push your hardest then give out, still trying to push the box. You are doing less work than what you have started with!

( Mind marking me for branliest? ; ) )
4 0
3 years ago
A peregrine falcon dives at a pigeon. The falcon starts with zero downward velocity and falls with the acceleration of gravity.
Reptile [31]

Answer:

t = 3.94 s

Explanation:

This can be modeled as a case of free fall motion. Because, the falcon is going down with acceleration, that is equal to acceleration due to gravity. To find the time taken by the falcon to intercept the pigeon, we will use second equation of motion for vertical direction:

h = v_{i}t + \frac{1}{2}gt^2

where,

h = height = 76 m

vi = initial speed of falcon = 0 m/s

t = time required = ?

g = acceleration due to gravity = 9.81 m/s²

Therefore,

76\ m = (0\ m/s)(t) + \frac{1}{2}(9.81\ m/s^2)t^2\\t^2 = \frac{(2)(76\ m)}{9.8\ m/s^2}\\\\t = \sqrt{ 15.49\ s^2}\\

<u>t = 3.94 s</u>

5 0
3 years ago
A 20 g ball of clay traveling east at 4.5 m/s collides with a 45 g ball of clay traveling north at 2.0 m/s. You may want to revi
german

Answer:

The ball travels with a speed of 1.96 m/s in a North East direction

Explanation:

Based on the law of conservation of linear momentum, we have that

m_{1}v_{1}+m_{2}v_{2}=(m_{1}+m_{2})v

Since this problem involves motion in both the x and y coordinates, we will solve it in the separate coordinates, and then find the resultant as our answer.

Momentum in the x- direction

in the x direction, v_{2}= 0. this makes m_{2}v_{2}=0

hence we have

20\times4.5=65v_{x}

v_{x}=1.385m/s

Momentum in the y- direction

in the y direction, v_{1}= 0. this makes m_{1}v_{1}=0

hence we have

45\times2.0=65v_{y}

v_{y}=1.385m/s

The resultant of the two vectors can be found using Pythagoras' theorem

v=\sqrt{1.385^{2}+1.385^{2}} =1.959

The direction of the resultant vector is found as

Tan^{-1}(\frac{1.385}{1.385})=45degrees

Hence the ball moves with a velocity of 1.96m/s in a North East direction

7 0
3 years ago
A copper wire expand when
o-na [289]

Answer: when heated and for answer dont forget to hit the brainliest

Explanation:

7 0
3 years ago
Read 2 more answers
Calculate the power provided by a 12 volt car battery with a rating of 350 amperes.
mamaluj [8]

Answer:

Option D

4200 W

Explanation:

Power, P is also given as the product of voltage and current, expressed as P=VI

Here, P is power, V is voltage in the xircuit and I is current theough voltage.

Taking 12 V for voltage across and 350A for current across circuit then power will be

P=350*12=4200 W

Therefore, option D is correct.

8 0
3 years ago
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