Answer:
Explanation:
a helmet is used for our safety this piece of equipment is used to protect us from getting any injury's on our heads such as concussions getting a cut on your head etc.
Answer:
31.55 m/s
Explanation:
Let the initial velocity of the arrow is u metre per second.
Angle of projection, θ = 40 degree
range = 100 m
Use the formula for the range.
![R = \frac{u^{2}Sin2\theta }{g}](https://tex.z-dn.net/?f=R%20%3D%20%5Cfrac%7Bu%5E%7B2%7DSin2%5Ctheta%20%7D%7Bg%7D)
100 = u^2 Sin(2 x 40) / 9.8
100 x 9.8 = u^2 Sin 80
u^2 = 995.11
u = 31.55 m/s
Energy at top = U = mgh = 40 * 9.8 * 12 = 4704 J
Energy at bottom = 1/2 mv² = 1/2 * 40 * 10² = 4000 / 2 = 2000 J
Energy Lost = Final - Initial = 4704 - 2000 = 2704 J
In short, Your Answer would be 2704 Joules
Hope this helps!
Answer: Correct answer is A
Explanation: Ap3x appointment
Answer:
The number of minutes in an hour - constant
Systolic blood pressure - variable
Freezing temperature of water in degrees Kelvin - constant
Ratings of daily anxiety - variable
Explanation:
A variable speaks of something that change while a constant is something that doesn't change.
The number of minutes in an hour is always constant which is 60.
Systolic blood pressure refers to the amount of pressure in your arteries during the contraction of your heart muscle and this changes base on the work done by the heart thus will be a variable.
Freezing temperature of water in degrees kelvin is always constant and it is 273.2 K.
Ratings of daily anxiety will be a variable because daily anxiety differs for different challenges of life.