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shepuryov [24]
3 years ago
13

What does Newton's first law of motion state? (3 points) a Every action has an equal and opposite reaction. b A body at rest wil

l stay at rest until it is acted upon by another object. c The amount of force acting on an object is equal to its mass times its acceleration. d All objects that have mass attract each other with a force that depends on their mass.
Physics
2 answers:
Kruka [31]3 years ago
5 0

Answer:

Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.Therefore B is correct

kirza4 [7]3 years ago
3 0

Answer:

B) A body at rest will stay at rest

Explanation:

A body in motion will stay in motion unless acted on by another force.

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Explanation:

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A brick is dropped (zero initial speed) from the roof of a building. The brick strikes the ground in 1.90 s. You may ignore air
kozerog [31]

Answer:

h=17m

v=18.6 m/s

Explanation: The question can be solved by applying kinematic equations of motion

Data

u=0

a=g

t=1.9 secs

firstly to calculate the height

s=ut+0.5at^2\\h=ut+0.5at^2\\h=0*1.9+0.5*9.81*1.9^2\\h=17.707 m

to find the final velocity

v=u+at\\v=0+9.81*1.9\\v=18.639

The acceleration graph is straight line of equation y=9.8 as acceleration is constant:

Velocity graph is given by y=9.8x ( y as velocity and x as time):

Displacement graph is given by y=4.9x^2 ( x as time, y as displacement):

These graphs are only applicable from x=0 to x=1.9 ... ignore the other graph sections

5 0
3 years ago
Why electric field inside the conductor zerqual to zero
Arlecino [84]
In electrostatics free charges in a good conductor<span> reside only on the surface.

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5 0
4 years ago
What is the difference between renewable and nonrenewable resources​
ololo11 [35]

Non renewable resources are resources that we can only use for so long until they’re gone and they can not be brought back. So like coal would be a non renewable resource. Renewable resources are resources that we can continue to use and we will always have them. An example of a renewable resource would be oxygen. We can breathe as much oxygen as we want but we will never run out of it.

8 0
3 years ago
Read 2 more answers
An equation for the period of a planet is 4 pie² r³/Gm where T is in secs, r is in meters, G is in m³/kgs² m is in kg, show that
marishachu [46]

Answer:

\displaystyle T = \sqrt{\frac{4\, \pi^{2} \, r^{3}}{G \cdot m}}.

The unit of both sides of this equation are \rm s.

Explanation:

The unit of the left-hand side is \rm s, same as the unit of T.

The following makes use of the fact that for any non-zero value x, the power x^{-1} is equivalent to \displaystyle \frac{1}{x}.

On the right-hand side of this equation:

  • \pi has no unit.
  • The unit of r is \rm m.
  • The unit of G is \displaystyle \rm \frac{m^{3}}{kg \cdot s^{2}}, which is equivalent to \rm m^{3} \cdot kg^{-1} \cdot s^{-2}.
  • The unit of m is \rm kg.

\begin{aligned}& \rm \sqrt{\frac{(m)^{3}}{(m^{3} \cdot kg^{-1} \cdot s^{-2}) \cdot (kg)}} \\ &= \rm \sqrt{\frac{m^{3}}{m^{3} \cdot s^{-2}}} = \sqrt{s^{2}} = s\end{aligned}.

Hence, the unit on the right-hand side of this equation is also \rm s.

8 0
3 years ago
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