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2 years ago

Is it true to say there are forces acting on an object that is traveling at 20 m/s in a

Physics

2 answers:

notsponge [240]2 years ago

7 0

Answer:

<em>Its true</em> i think

Explanation:

natulia [17]2 years ago

7 0

There don’t have to be forced acting on something that is travelling at a constant velocity (Newton’s 1st Law).

If forced are acting they must be balanced forced with Net force = zero.

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When a ball is launched from the ground at a 45° angle to the horizontal, it falls back to the ground 50 m from the launch point

Inessa [10]

Answer:

Explanation:

Given

angle through which ball is launched $=45^{\circ}$

Range of ball=50 m

Range of projectile is $=\frac{u^2sin2\theta }{g}$

$50=\frac{u^2sin90}{9.8}$

u=22.136 m/s

If ball is thrown straight upward

$v^2-u^2=2as$

$0-(22.136)^2=2(-9.8)s$

$s=\frac{22.136^2}{2\times 9.8}$

s=25 m

(b)For Projectile time of flight is

$t=\frac{2usin\theta }{g}$

$t=\frac{2\times 22.136\times sin45}{9.8}$

t=3.19 s

7 0

2 years ago

A hockey puck is struck so that it slides at a constant speed and strikes the far side of the rink, 58.2 m away. The shooter hea

DENIUS [597]

Answer:

$v = 33.66 m/s$

Explanation:

Let hockey puck is moving at constant speed v

so here we have

$d = vt$

so time taken by the puck to strike the wall is given as

$t = \frac{58.2}{v}$

now time taken by sound to come back at the position of shooter is given as

$t_2 = \frac{58.2}{340}$

$t_2 = 0.17s$

so we know that total time is 1.9 s

$1.9 = t + t_2$

$1.9 = t + 0.17$

$1.9 - 0.17 = t$

$t = 1.73 s$

now we have

$1.73 = \frac{58.2}{v}$

$v = 33.66 m/s$

7 0

2 years ago

How can a gas become a good conductor? Simpler answers would be helpful.

Alex_Xolod [135]

A gas has to become ionisied in order to become a conductor. It must have a chain reaction in which atoms in it became unstable, in which they loose stabile electronic configuration. In order for a gas to become a conductor, it must have free particles, and it can happen only in ionisied gas.

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3 years ago

If you wanted to learn more about ancient scientific knowledge, whose life<br> would you research?

yaroslaw [1]

Ptolemy life is probably my most recommenced

7 0

3 years ago

Read 2 more answers

Hey guys i need song requests dbl

Andrew [12]

Answer:

Shiloh dynasty, jucie wrld or xxx or twenty one plot