PHYSICS MIDDLE SCHOOL

During the summer months, why is the average temperature much higher in many regions of the globe?A. There is no snow.

B. The amount of sunlight reaching the environment stays constant.

C. More sunlight reaches the environment.

D. Less sunlight reaches the environment.

Answers

Answer 1
Answer: C. More sunlight reaches the environment.
Answer 2
Answer: C. More Sunlight reaches the enviroment

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A student that jumps a vertical height of 50 cm during the hang time activity.a. What is the hang time of the student?
b. What speed must the student leave the ground with to reach that height?

Answers

The hang time of the student is 0.64 seconds, and he must leave the ground with a speed of 3.13 m/s

Why?

To solve the problem, we must consider the vertical height reached by the student as max height.

We can use the following equations to solve the problem:

Initial speed calculations:

v_(f)^(2)=v_(o)^(2)+2*a*d

At max height, the speed tends to zero.

So, calculating, we have:

v_(f)^(2)=v_(o)^(2)+2*a*d\n\n0=v_(o)^(2)+2*(-9.81(m)/(s^(2)))*0.5m\n\nv_(o)^(2)=9.81(m^(2) )/(s^(2))\n\nv_(o)=\sqrt{9.81(m^(2) )/(s^(2))}=3.13(m)/(s)

Hang time calculations:

We must remember that the total hang time is equal to the time going up plus the time going down, and both of them are equal,so, calculating the time going down, we have have:

y-yo=vo.t+(1)/(2)*9.81(m)/(s^(2))*t^(2) \n\n0.5m-0=0*t+4.95*t^(2)\n\nt^(2)=(0.5)/(4.95)\n\nt=√(0.101)=0.318s

Then, for the total hang time, we have:

TotalHangTime=2*0.318seconds=0.64seconds

Have a nice day!

2. A ball tied to a pole by a rope swings in a circular path with a centripetal acceleration of 2.7 m/s. If the ball has atangential speed of 2.0 m/s, what is the diameter of the circular path in which it travels?​

Answers

Answer: The diameter of the circular path is 2.96m

Explanation: centripetal acceleration = tangential speed^2 / radius of the circular path.

Centripetal acceleration = 2.7m/s^2

Tangential speed = 2.0m/s

Radius = 2.0^2 / 2.7 = 4/2.7

= 1.48m

Diameter = radius*2

= 1.48*2 = 2.96m.

What occurs when an object travels in a curved path

Answers


If it continues long enough, then the object
returns to where it started.

Answer:

If it continues long enough, then the object

returns to where it started.

Explanation:

Which body system processes into a useable source of energy

Answers

possibly limpathic or respiratory system

A place in which there is no matter is called a (n)

Answers

By definition, a region of space that contains no matter at all is a vacuum.

How do simple machines make work easier? A.
They add energy to the work.

B.
They increase the force needed to work.

C.
They reduce the speed of work.

D.
They increase the distance over which a force is applied.
C.?

Answers

Answer:  D.  They increase the distance over which a force is applied.

Explanation:

Simple machines are basic mechanical devices which make our work easier like lever, pulley, wheel and axle, inclined plane, wedge and screw. The magnitude of the force or direction is altered using a simple machine. They increase the distance over which a force is applied. They use mechanical advantage to increase the magnitude of the force.

It is A: They add energy to the work
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