Mph (miles per hour) nfoejnfinweifniewqnf
Answer:
The top of the ladder go down by 0.15 m.
Explanation:
Here we have right angled triangle.
Hypotenuse = 4.6 m
Bottom angle = 66º
Length from ladder bottom to wall bottom = 4.6 cos66 = 1.87 m
Length from ladder top to wall bottom = 4.6 sin66 = 4.20 m
New length from ladder bottom to wall bottom = 1.87 + 0.31 = 2.18 m
By Pythagoras theorem
New length from ladder top to wall bottom is given by
Distance the top of the ladder go down = 4.20 - 4.05 = 0.15 m
Answer:
41.3 m/s^2 option (e)
Explanation:
force, F = 6.81 N
mass, m = 165 g = 0.165 kg
Let a be the acceleration of the puck.
Use newtons' second law
Force = mass x acceleration
6.81 = 0.165 x a
a = 41.27 m/s^2
a = 41.3 m/s^2
Thus, the acceleration of the puck is 41.3 m/s^2.
Answer:
D.90°
Explanation:
First remember that the magnitude of a vector , lets say T is the square of the dot product with itself.
This is to say
|T|=√(T×T)
Assume A≠0 and B≠0 then
Square both sides of the below equation
|A+B|²=|A-B|²
(A+B)²=(A-B)²
A(A+B)+B(A+B)=A(A-B)-B(A-B)
A²+AB+AB+B²=A²-AB-AB+B²
A²+2AB+B²=A²-2AB+B²
You notice that it simplifies to
2AB= -2AB
This means that A×B =0
Hence the angle between the vectors should be 90°