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3 years ago

Please help fast.

Physics

2 answers:

Zina [86]3 years ago

6 0

A. m/s is a unit for speed.

Minutes, meters, and kilometers are incorrect.

Please brainliest me if this helped; trying to level up!

mario62 [17]3 years ago

3 0

The unit for speed is meter per second ( m/s).

Answer : Option A

Explanation:

The speed is the measure of the total distance traveled over a specified or particular time. Therefore, and as we know that the unit of distance is meter and that of time is seconds according to the S. I. unit of system. Therefore the unit of speed written as the meter per second, or, m / s, or, m s -1.

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g If you keep the launch angle fixed, but double the initial launch speed, what happens to the range?

kiruha [24]

Answer:

Range will become 4 times of initial range

Explanation:

Let the velocity of projection is u

And angle at which projectile is projected is $\Theta$

And acceleration due to gravity is $g\ m/sec^2$

So range of projectile is equal to $R=\frac{u^2sin2\Theta }{g}$ ........eqn 1

Now in second case it is given that velocity of launching is doubled

So new velocity $u_{new}=2u$

So new range will be equal to $R_{new}=\frac{(2u)^2sin2\Theta }{g}=\frac{4u^2sin2\Theta }{g}$ .....eqn 2

Now dividing eqn 2 by eqn 1

$\frac{R_{new}}{R}=\frac{4u^2sin2\Theta }{g}\times \frac{g}{u^2sin2\Theta }$

$R_{new}=4R$

So if we double the initial launch speed then range will become 4 times

4 0

4 years ago

!!PLEASE ANSWER ASAP!!

ikadub [295]

Work done = force * distance
2m * 9.8
work done = 19.6 J

5 0

3 years ago

A girl and a boy pull in opposite directions on strings attached to each end of a spring balance. Each child exerts a force of 2

BabaBlast [244]

Answer:

yo they deleted my answer. The answer is 0N

Explanation:

so when two forces pull on an object from opposite sides with the same force (in this case its 20N), then the object is in equilibrium at 0N.

So its clear that there is one person on the the opposite side.

SOOO generally: (left or down) would be considered negative in an equation. And the other person (right or up) would be considered positive. So if both forces are the same numbers on opposite sides then the answer is 0 (if you add both of them).

0 is the number of equilibrium.

OK, so the equation would be -20N + 20N and then badda bing badda boom viola, the answer: 0N

thanks for coming to my TED talk. I hope they don't delete this answer.

5 0

3 years ago

Frequency refers to the number of wavelengths that pass a fixed point in a minute. true or false

Art [367]

Frequency refers to the number of wavelengths that pass a fixed point in a minute. true or false

Answer:True

7 0

4 years ago

For Valentine’s Day Sally received a helium-filled balloon at a party. On returning home she accidently left the balloon in the

gayaneshka [121]

Answer:

The helium molecules move closer together when it's cold causing the balloon to deflate

Explanation:

5 0

3 years ago