Homework Statement
The energy density (energy per unit area per unit time) arriving from the sun at the surface of the Earth is 1300 J/m2s. Calculate the mass loss of the sun in one year. (The Earth is about 1.49 x 1011 m from the sun.)
Homework Equations
ΔE = Δmc2
KE = (γ-1)mc2
The...
Homework Statement
An electron's position is given by r(t)=r(0)+c1*t, θ(t)=θ(0)+c2*t, where r(0), c1, θ(0), and c2 are known constants. What is the kinetic energy of the electron? (mass=m)
Homework Equations
KE=(1/2)Iω2=(1/2)mr2ω2
The Attempt at a Solution
plugging in m for mass...
Homework Statement
A bullet of mass "m" is fired from a cannon located at the origin. The shell moves in the yz plane, where "z" is the vertical coordinate, with an initial velocity of magnitude "v0" at an angle θ above the y-axis.
A) What is the torque on the shell, about the origin, as a...
Homework Statement
A mass "m1" moves along the x-axis with velocity of magnitude v0 on a frictionless table. It strikes another mass m2 which is initially at rest. The mass m1 goes off along the y-axis. If half the original kinetic energy is lost in the collision, with what speed and at what...
Homework Statement
A block of mass 'm' is placed on an inclined plane which has an adjustable angle with the horizontal. The angle is increased slowly from zero until the block just starts to slide. This angle is called the critical angle, θs.
Express the coefficient of friction in terms...
I decided to integrate until I got the position function and solved for "t" and just plugged that into v(t). Thank you for your help, I don't know why I wanted to use that equation! haha
One dimensional motion-- object accelerating straight downwards
Homework Statement
A rocket, initially at rest, is fired at "t = 0" vertically down from a building of height "H". The rocket's acceleration, including the effects of gravity, is downwards with increasing magnitude given by a(t)...