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Galina-37 [17]
3 years ago
7

PLEASE HELP ME

Physics
1 answer:
RoseWind [281]3 years ago
5 0
KE = ½ m v^2
so it depends on its speed (and mass)
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______ is most resistant to thermal energy transfers. a. copper wire b. aluminum foil c. water d. foam insulation
Reika [66]

Answer:

Water

Explanation:

Because it does not conduct much energy.

8 0
3 years ago
An object 82 cm high forms a virtual image 4.1 cm high located 4.6 cm behind a mirror. Find the object distance.
ioda

Answer:

The object distance is 92 cm.  

Explanation:

let v be the image distance and h be the height of the image, let u the be the object distance and H be the height of the object.

then, the magification of the mirror is given by:

m = -v/u and m = h/H

so, -v/u = h/H

         u = -v×H/h

            = -(-4.6)×(82)/(4.1)

            = 92 cm

Therefore, the object distance is 92 cm.

8 0
3 years ago
When four atomic orbitals are mixed to form hybrid orbitals, how many hybrid orbitals are formed?
lilavasa [31]

When four atomic orbitals are mixed to form hybrid orbitals, 4 x sp3 hybrid orbitals are formed.

<span>Carbon's 2s and all three of its 3p </span>orbitals<span> hybridize to form four sp</span>3 orbitals. These orbitals<span> then bond with four hydrogen atoms through sp</span>3-s <span>orbital </span>overlap, creating methane. 

6 0
3 years ago
Read 2 more answers
Explain, in terms of impulse and momentum, how airbags help avoid injury in a car crash?
valentinak56 [21]

Explanation:

Impulse is the change in momentum.  It is also equal to the average force times the change in time.

J = Δp

F Δt = m Δv

The change in momentum is a fixed number; your mass, initial velocity, and final velocity are constant.

F Δt = k

So force and time are inversely proportional.  What this means is, we can either have a large force over a short period of time, or a small force over a long period of time.

Obviously, we want a small force over a long period of time.  Without airbags, your head would hit the steering wheel very quickly.  With airbags, your head has time to decelerate, so there's less force.

8 0
3 years ago
A dog is sniffing around for a bone. He walks 3.6 m east and 6.0 m north. What are the magnitude and direction of the dog from h
Ksju [112]
Vectorial form:

     3.6 m east => 3i


     6.0 north => 6 j

     Final position = 3.6i + 6j

Magnitude = √[ (3.6)^2 + 6^2] = √[12.96 + 36] = √48.96 = 7.0 m

Direction => arc tan (6/3.6) = arc tan (1.67) = 59.0 °

Answer: the dog is at 7.0 m, 59.0° to the north of the east from the starting point.
6 0
3 years ago
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