Answer:
Explanation:
deceleration a
v² = u² - 2as
0 = 7.5² - 2 a x .15
a = 187.5 m / s²
If R be the force exerted by hand
R- mg = ma
R = mg + ma
= .27 ( 9.8 + 187.5 )
= 53.27 N
Work done by hand
= force x displacement
= 53.27 x - .15
= - 8 J
Electrons are very emotional and compulsive things. They feel
an intense desire to get away from negatively charged things or
places, and an equally strong desire to get closer to positively
charged ones, as if according to some law of nature.
By means of chemical things inside batteries that I don't understand,
one end of the battery is kept positively charged and the other one
negatively charged. So if there's anything between the terminals that
an electron can easily flow through, they'll do it !
GPE=mgh
m= 12.5kg
g= 9.81 always
h=?
568=12.5*9.81*h
Solve for h
You will get 4.63m
Answer: False
explanation: because Total momentum is conserved only if the collision can be considered isolated from the influence of net external forces
Answer:
Explanation:
Let the velocity of projectile be v and angle of throw be θ.
The projectile takes 5 s to touch the ground during which period it falls vertically by 100 m
considering its vertical displacement
h = - ut +1/2 g t²
100 = - vsinθ x 5 + .5 x 9.8 x 5²
5vsinθ = 222.5
vsinθ = 44.5
It covers 160 horizontally in 5 s
vcosθ x 5 = 160
v cosθ = 32
squaring and adding
v²sin²θ +v² cos²θ = 44.4² + 32²
v² = 1971.36 + 1024
v = 54.73 m /s