ingrid kicks a football with an initial velocity of 12 m/s at an angle 45 relative to the ground. what is the horizontal component of the initial velocity to the nearest tenth
Answers
Let's assume that the coordinate system is defined as positive in the first quadrant.
The system has its origin in the place where Ingrid kicks the football ball.
We have then that the horizontal component is given by:
Rewriting we have:
Rounding the obtained result we have:
Answer:
The horizontal component of the initial velocity to the nearest tenth is:
is correct answer => 8.5 m/s
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Answers
PEi + KEi = PEf + KEf
Since the object is falling from rest, the initial kinetic energy is zero. Also, since the object hits the ground at its final position, the final potential energy is zero. This leaves:
PEi = KEf
mgh = 1/2 mv^2
*cancel out mass on both sides of the equation
gh = 0.5v^2
v = sqrt(2gh) = sqrt(2*9.81*4.5) = 9.40 m/s --> final ans.
Answers
29.5 Earth days in duration
B. food web.
C. reservoir.
D. biotic community.
answered|Score .8
Answers
Answers
Answer:
Unit Cell
Explanation:
- A unit cell is the smallest fundamental particle of a crystal structure that represents the structure of a crystal.
- Long-range, three-dimensional repetitiveness of this unit cell forms a crystal. A unit cell is composed of ions or atoms in a particular arrangement forming a well-defined structure.
- Crystal have a sharp melting and boiling point and when cut using a tool, they give a sharp edge on the pieces.
Answers
Answer:
Explanation:
One
I've never heard of a mass defect before you asked this question. Interesting concept.
Givens
Number of neutrons =207 - 82 = 125
Number of protons = 82
The amu of a proton is 1.00728
The amu of a neutron is 1.00866
Solution
Find out the actual mass of the Lead atom
Actual mass = 82*1.00728 + 125*1.00866
Actual mass = 208.67946
The mass defect = 208.67946 - 207 = 1.67946
That is the proper way to calculate mass defect.
Apparently the way you are supposed to do it is
Mass defect = 208.67946 - 206.975897= 1.703563 which means that C is the closest answer. You will have to look at your notes to see if amu for protons and neutrons are what I used.
Two
The number of protons is the number of Uranium on the periodic table.
92 protons. 92 comes from the position on the periodic table.
You can get the same thing by Taking its relative mass (238) and subtracting the neutrons (146) which is 238 - 146 = 92
Answer:
92 protons
Explanation:
The mass number is 238, so the nucleus has 238 particles in total, including 146 neutrons. So to calculate the number of neutrons we have to subtract: 238 − 146 = 92
Answers
= (end speed - start speed) / (time for the change)
= (0 - 37 m/s) / (6 sec)
= ( - 37 / 6) (m/s²)
= - 6-1/6 m/s²
= -6.1667 m/s² (rounded)