Whats the origin of all stars? a) supernova b) dwarfs c) protostars d) nebulae

2 answers:

5 0

All stars originated from c., protostars. Protostars are the earliest phase of the process of star evolution.

-Starry Sky

Oh lmao, my name and the irony. cx

nydimaria [60]3 years ago

4 0

What is the origin of all stars?

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A ball is dropped from 215m. How long will it take to reach the ground? Use 9.8

valkas [14]

Answer:

The time is $t = 6.62 \ s$

Explanation:

From the question we are told that

The height of the platform where the ball was dropped from is s = 215 m

The acceleration due to gravity is $g = 9.8 \ m/s^2$

Generally from kinematic equations

$s = ut + \frac{1}{2} gt^2$

Here u is the initial velocity of the ball and the value is u = 0 m/s given that the ball was at rest before it was dropped

$21 5 = 0 * t + \frac{1}{2} * 9.8t^2$

=> $21 5 = 4.9t^2$

=> $t^2 = \frac{215}{4.9}$

=> $t = 6.62 \ s$

7 0

3 years ago

THIS IS A SCIENCE QUESTION, sorry if it says physics, this is middle school science

Black_prince [1.1K]

Answer:

1. Examples of transverse waves include vibrations on a string and ripples on the surface of water. We can make a horizontal transverse wave by moving the slinky vertically up and down. In a longitudinal wave the particles are displaced parallel to the direction the wave travels.

2. There are two basic types of wave motion for mechanical waves: longitudinal waves and transverse waves. The animations below demonstrate both types of wave and illustrate the difference between the motion of the wave and the motion of the particles in the medium through which the wave is travelling.

3. f is force and 人 is wave length

3 0

3 years ago

A 12.6-kg monkey is hanging by one arm from a branch and swinging on a vertical circle. As an approximation, assume a radial dis

Zinaida [17]

Answer:

a)27.3N

b)150.78N

Explanation:

Having in mind the conservation of energy, as the monkey goes up (gaining potential gravitational energy) the kinetic energy must be reduced, so reducing the velocity of the monkey. So the maximum velocity will be at this lower point with a velocity of 1.36m/s

From this velocity and the radius we can calculate the angular velocity for the monkey center of mass:

$w=\frac{1.36m/s}{0.853m} =1.594 /s$

with this we can calculate the centripetal force magnitude:

$F=m*w^{2} *r=12.6kg*(1.594/s)^{2} *0.853m=27.3N$

On the mokey center of mass we have two opposite forces acting, the tension of the arm and the weight, in order for the monkey to continue swinging the resolt of this two forces must be equal to the centripetal force:

$T-P=F=>T=F+P$