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slamgirl [31]
3 years ago
5

Please help. No links please answers will give brainliest

Physics
2 answers:
docker41 [41]3 years ago
7 0
Ik that 2 is a screw and drill 3- rod wheels
insens350 [35]3 years ago
5 0

Answer: 1 inclined plane  and box mover trolley

2 screw and drill

3 The axle, or rod and wheels

4 slides, ramps, and hills.

5 yes because they help the ball move quicker

6 i am not sure about this one)

Explanation:i do not know i am guessing

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A boy is whirling a stone around his head by means of a string. The string makes one complete revolution every second; and the m
Damm [24]

Answer

given,                                                

Tension of string is F                                                  

velocity is increased and the radius is not changed.      

the string makes two complete revolutions every second

consider the centrifugal force acting on the stone          

  = \dfrac{mv^2}{r}                          

now centrifugal force is balanced by tension

T =\dfrac{mv^2}{r}                                

From the above expression we can clearly see that tension is directly proportional to velocity and inversely proportional to radius.

When radius is not changing velocity is increasing means tension will also increase in the string.

8 0
3 years ago
Select the correct answer. Which electromagnetic waves have the highest frequencies in the electromagnetic spectrum?
Law Incorporation [45]

Answer:

Your answer would be C, Radio waves.

Explanation:

4 0
3 years ago
PLEASE ANSWER-Why are loose electrons needed for heat conduction?
dolphi86 [110]

Answer:

Why do metals conduct heat so well? The electrons in metal are delocalised electrons and are free moving electrons so when they gain energy (heat) they vibrate more quickly and can move around, this means that they can pass on the energy more quickly.

8 0
2 years ago
according to newton's second law of motion of the net force acting on the object increases while the mass of the object remains
Licemer1 [7]

Answer:

The Acceleration will increase

Explanation:

Newton's Second Law of motion: It states that the rate of change of momentum is directly proportional to the applied force and takes places along the direction of the force.

It can be expressed mathematically as,

F ∝ m(v-u)/t

Where (v-u)/t = a

F  = kma.

F = force, m = mass of the body, a = acceleration, k = constant of proportionality which tend to unity for a unit force, a unit mass, and a unit acceleration.

Therefore,

F = ma.

From the equation above,

If the net force acting on a body increase, while the mass of the body remains constant, the acceleration will also increase.

4 0
3 years ago
Please help! Will give thanks and branliest!!!!
slamgirl [31]
<span>The two factors that act on parachutes are gravity and air resistance, which is also called drag. Gravity acts as a force to pull parachutes down to the surface of the Earth, while air resistance generates movement in the opposite direction of the falling parachute, and essentially pushes the parachute upward. hope this helps!:)</span>
6 0
3 years ago
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