PHYSICS MIDDLE SCHOOL

a cannon ball is fired at 40 degrees with an initial velocity of 180 m/s. what is the maximum height reached by the cannonball?

Answers

Answer 1

Answer:

A ball is fired with speed v = 180 m/s at an angle 40 degree

So here we can say the components of velocity is given as

$v_(x) = 180 cos40 = 137.9 m/s$

$v_y = 180 sin40 = 115.7 m/s$

now when ball will reach the maximum height its velocity in vertical direction will become zero

so here we can say

$v_(fy) = 0$

now using kinematics we will have

$v_(fy)^2 - v_y^2 = 2 a d$

$0 - 115.7^2 = 2(-9.8)(H)$

so maximum height is

$H = 683 m$

so it will reach at maximum height of 683 m

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Definition of transalatory motion

Answers

Translational motion is the motion by which a body shifts from one point in space to another. One example of translational motion is the the motion of a bullet fired from a gun. An object has a rectilinear motion when it moves along a straight line. Hope this helps! :)

Answer:

Translational motion is the motion of body where body moves in the linear path. It is the motion in which all points of a moving body move uniformly in the same line or direction.

If john is traveling at 8 feet per minute east for 2 hours what is his displacement

Answers

Hello!

The answer is: 960 East feet.

Why?

We need to apply the following formula:

$xf=xi+v*t$

and

$displacement=xf-xi$

So, by substituting we have:

$xf-xi=(8ft)/(min) *120min\nd=960ft$

Have a nice day!

When is momentum conserved?A. it is conserved when only two objects collide; more than two objects can't conserve momentum.

B. it is always conserved.

C. momentum is conserved when the system is closed, which means there are no forces, like friction, acting on it.

D. momentum is never conserved.

Answers

C. momentum is conserved when the system is closed, which means there are no forces, like friction, acting on it.

I took the test

What happens if there is too much friction?

Answers

Answer: there would be no motion

Explanation:

There would be no motion,as the object get stuck

Answer:

Friction is a force that opposes motion between any surfaces that are touching. Friction can work for or against us. For example, putting sand on an icy sidewalk increases friction so you are less likely to slip. On the other hand, too much friction between moving parts in a car engine can cause the parts to wear out.

A pole-vaulter is nearly motionless as he clears the bar, set 4.2 m above the ground. He then falls onto a thick pad. The top of the pad is 80 cm above the ground, and it compresses by 50 cm as he comes to rest. What is the magnitude of his acceleration as he comes to rest on the pad