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lesya [120]
3 years ago
14

For each of the

Physics
1 answer:
maksim [4K]3 years ago
6 0

Explanation:

a) Hammer hits a nail

Action: Hammer hitting the nail

Reaction: Nail Hitting the hammer.

B) . Earth's gravity pulls down on a book.

Action: Earth pull downward on the book.

Reaction: The Book pull's the Earth Upward.

C) A helicopter blade pushes  air downward.

Action: Blade push air downward

Reaction: The force in pushes the helicopter upward.

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Please, I need help with this.
solmaris [256]

this is the answer :)

6 0
3 years ago
Read 2 more answers
Three small masses are positioned as follows: 2.0 kg at (0.0 m, 0.0 m), 2.0 kg at (2.0 m, 0.0 m), and 4.0 kg at (2.0 m, 1.0 m).
melamori03 [73]
Refer to the diagram shown below.

The given data is

mass, kg   Coordinates. m
-------------   -----------------
   2               (0, 0)
   2               (2, 0)
   4               (2, 1)

Total mass, M = 2+2+4 = 8kg
Let (x,y) be the coordinates of M.

Then, taking moments about the origin, we obtain
8x = 2*0 + 2*2 + 4*2 = 12
x = 1.5 m

8y = 2*0 + 2*0 + 4*1 = 4
y = 0.5 m

Answer:  (1.5, 0.5) m




6 0
2 years ago
Victor has 100 trading cards, each with a distinct power level between 101 and 200 inclusive. Whenever he heads out, he always r
Alenkinab [10]

Answer:

Victor will always be able to select 4 of those cards with the following property

Explanation:

Number of trading cards = 100

victor selects 21 cards

let the 4 cards be labelled : A,B,C and D

The average power level of : A,B,C,D = ( A + B + C + D )/ 4 = P

let the two pairs be : ( A + B ) and ( C + D )

note: average power of each pair = P  and this shows that

( A + B ) = ( C + D ) for Victor to select 4 cards out of the 21 cards that exhibit the same property

we have to check out the possible choices of two cards out of 21 cards yield distinct sums.

= C(21,2)=(21x20)/2 = 210.

from the question the number of distinct sums that can be created using 101  through 200 is < 210 .

hence it is impossible to get 210 distinct sums therefore Victor will always be able to select 4 of those cards

4 0
3 years ago
Select all that apply. PLZ
Crank
A and c

do not complete the circuit there is no battery on a and paper dose not conduct electricity
5 0
2 years ago
How does the total expenditures test help determine demand elasticity?
s2008m [1.1K]

Answer: The three causes of demand elasticity are measured by looking at the relative change in demand as it responds to a change in price. How does the total expenditures test help determine demand elasticity? By finding out what the total expenditures are for a product, a business is able to determine the demand elasticity.

8 0
2 years ago
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