Give five characteristics of a metal

Physics

1 answer:

Kipish [7]3 years ago

3 0

Answer:

are good conductors of heat,are you used to make doors utensils e.t.c.

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An object is acted upon by a constant force which gives it a constant acceleration a. At a certain time t1, having started from

Elenna [48]

Answer:

$t_2=\sqrt{2}(t_1)$

Explanation:

The kinetic energy of a body is that energy it possesses due to its motion. In classical mechanics, this energy depends only on its mass and speed, as follows:

$K=\frac{mv^2}{2}$

The speed in an uniformly accelerated motion is given by:

$v=at$

Replacing this expression in the formula for the kinetic energy, we have:

$K=\frac{ma^2t^2}{2}\\$

So, if we have $K_2=2K_1$ :

$K_1=\frac{ma^2t_1^2}{2}(1)\\K_2=\frac{ma^2t_2^2}{2}\\2K_1=\frac{ma^2t_2^2}{2}\\K_1=\frac{ma^2t_2^2}{4}(2)\\$

Equaling (1) and (2) and solving for $t_2$ :

$\frac{ma^2t_1^2}{2}=\frac{ma^2t_2^2}{4}\\t_2=\frac{4t_1^2}{2}\\t_2=\sqrt{2t_1^2}\\t_2=\sqrt{2}(t_1)$

7 0

4 years ago

Why does an object in motion stay in motion unless acted on by an unbalanced force?

Svet_ta [14]

Answer: A) because forces are what stop and start motion

Explanation:

From Newton's first law, an object tends to stay in state of rest or motion unless acted upon by an unbalanced external force. This is also known law of inertia. This is because a force can stop or start a motion. A force cause body to accelerate to decelerate otherwise the body continues with constant speed.

7 0

3 years ago

Read 2 more answers

Consider the three displacement vectors

matrenka [14]

Answer:

Explanation:

$\overrightarrow{A} = 3\widehat{i}+3\widehat{j}$