Recent content by soul5

Homework Statement Ok so I'm doing this practise problem but I have no clue what to do. "A radioactive sample intended for irradiation of a hospital patient is prepared at a nearby lab. The sample has a half-life of 83.61 h. What should it's initial activity be if it's activity is to be...

that's what I got to the first time, but it was wrong...

Homework Statement A block of mass m = 3.4 kg is dropped from height h = 44 cm onto a spring of spring constant k = 1920 N/m (Fig. 8-38). Find the maximum distance the spring is compressed. [PLAIN]http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c08/fig08_36.gif Homework...

PE is just PE = 1/2kx^2 but how do we find k? 160N/0.16m = k ?

Homework Statement http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c07/pict_7_36.gif gives spring force Fx versus position x for the spring–block arrangement http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c07/pict_7_11.gif The scale is set by Fs = 160 N. We...

Title says all.

strictly horizontal why do you ask?

Homework Statement A person pushes with force of 220N on a 40 kg create. The coefficent of kinetic friction of 0.35. What is the magnitude of the frictional force? Homework Equations Ff = uN The Attempt at a Solution so do I just go Ff = 0.35*(40kg)(9.81m/s^2)...

Homework Statement The velocity of a 6 kg particle is given by v = (5ti + 4t2j ) m/s, with time t in seconds. At the instant the net force on the particle has a magnitude of 43 N, what are the direction (relative to the positive direction of the x axis) of (a) the net force and (b) the...

how do I find vy?

So once I find Vy I use Vx^2 + Vy^2 = V^2?

Homework Statement A moderate wind accelerates a pebble over a horizontal xy plane with a constant acceleration a = (6i + 7j)m/s^2 . At time t = 0, the velocity is (3i)m/s . What are the (a) magnitude and (b) angle of its velocity when it has been displaced by 12.0 m parallel to the x axis...

I have 2 question. 1) In projectile motion is the velocity in the x compontent constant, while above the release point? 2) Is Y = Voy * t - 0.5 * 9.81 * t^2 the equation used to find the heigth at any given time? Thank You.

I have another question what equations can I use to find intial v, the angle and maximum height on projectile motion?

I have a question when any object is in project motion is the vertical acceleration of the object equal to 9.81m/s^2 (gravity)?