Does Solid surfaces reflect better than liquid surfaces? If why?

A lever has an effort arm that is 8 meters long and the resistance arm that is 1.5 meters long, how much effort is needed to lif

ruslelena [56]

We are given with two measurements of the arm and an input weight. To answer this problem,we need to balance the forces and use the lengths of the arms.
209 N * 8 m = x * 1.5 m
x = 1114.67 N

it takes 1114.67 N to lift the input weight

6 0

3 years ago

Read 2 more answers

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

A machine in an ice factory is capable of exerting 3.31 × 102 N of force to pull large blocks of ice up a slope. The blocks each

tankabanditka [31]

Answer: $\theta =1.43 ^{\circ}$

Explanation:

Given

Force exerted by machine $F=3.31 \times 10^2 N$

Weight of Block $W=mg=1.32\times 10^4 N$

Considering inclination to be $\theta$

After resolving Forces We get

$mg\sin \theta =F$

$\sin \theta =\frac{F}{mg}$

$\sin \theta =\frac{3.31 \times 10^2}{1.32\times 10^4}$

$\sin \theta =2.507\times 10^{-2}$

$\sin \theta =0.02507$

$\theta =\sin ^{-1}(0.02507)$

$\theta =1.43 ^{\circ}$

7 0

3 years ago

When Lucy saw a shark, a limbic system structure known as the _____ became activated and enabled her to rapidly respond to the t

UNO [17]

Answer:

i think it's the paleomammalian cortex

7 0

3 years ago

Please help!!

Ronch [10]

Answer:

Explanation:

The distance will be the total distannce covered during the journey.

If you move 3 meters East and move 4 meters north, then the distance will be calculated as;

Distance = distnace through East+distance through north

Distance = 3m + 4m

<em>Distance = 7m</em>

Displacement is the distance covered in a specified direction. It is the shortest distance covered by me. This can be gotten using the Pythagoras theorem.

d² = 3²+4²

d² = 9+16

d² = 25

d = √25

d = 5m

<em>Hence the displacement of the object is 5metres</em>

5 0

3 years ago