Answer: The spring potential energy must equal or exceed the energy to raise the mass to loop height and the minimum kinetic energy needed to keep the mass in contact with the top of the loop
kd² = 5Mrg
h = kd²/2Mg
Explanation:
at top of loop
Mv²/r = Mg
v² = rg
½kd² = ½Mv² + Mgh'
½kd² = ½M(rg) + Mg(2r)
½kd² = 2.5Mrg
kd² = 5Mrg
½kd² = Mgh
h = kd²/2Mg
Answer:
F = 18195.59 N or F = 18196 rounded up
Explanation:
force = GMm/d^2
G = 6.67x10^-11
M = 5.98x10^24 kg
m = 2170kg
d = 6370000 + 527000 = 6897000m
putting all values (6.67x10^-11)(5.98x10^24)(2170)/(6897000^2) = 18195.59....
Answer:
Object could only be moving with increasing speed.
Explanation:
Let us consider the general formula of acceleration:
a = (Vf - Vi)/t
Vf = Vi + at -------- equation 1
where,
Vf = Final Velocity
Vi = Initial Velocity
a = acceleration
t = time
<u>FOR POSITIVE ACCELERATION:</u>
Vf = Vi + at
since, both acceleration and time are positive quantities. Hence, it means that the final velocity of the object shall be greater than the initial velocity of the object.
Vf > Vi
It clearly shows that if an object moves with positive acceleration. <u>It could only be moving with increasing speed.</u>
Solving the same equation for negative acceleration shows that the final velocity will be less than initial velocity and object will be moving with decreasing speed.
And for the constant velocity final and initial velocities are equal and thus, acceleration will be zero.
A concave mirror is a curved mirror that bulges inward. Objects reflected in concave mirrors often appear bigger than they really are, although the specifics of how the image appears depends upon the object's distance from the mirror. Concave mirrors are used in car headlights, in dentist's offices and in makeup mirrors.
To find the kinetic energy . You have to use this equation : 1/2m(v^2) .
