Homework Statement
A long uniform beam is pivoted at one end. A force of 300N is applied to hold the beam horizontally.
http://img182.imageshack.us/img182/4219/11062008vt2.png
What is the weight of the beam?
Homework Equations
Don't know which question to use... need help!
The...
Homework Statement
The density of the material of a rectangular block is determined by measuring the mass and linear dimensions of the block. The table shows the results obtained, together with their uncertainties.
Mass = (25.0 \pm 0.1)g
Lenght = (5.00 \pm 0.01)cm
Breath = (2.00 \pm...
Homework Statement
The bore hole of depth 2000m contains both oil and water as shown. The pressure at the bottom is 17.5MPa. The density of the oil is 830kgm^-3 and the density of the water is 1000kgm^-3.
http://img384.imageshack.us/img384/6944/10062008fj0.png
What is the depth x of the...
I don't think this question need calculus! It is a multiple choice question and the choices are:
(A) (8.0 \pm 0.2)\omega
(B) (8.0 \pm 0.6)\omega
(C) (8 \pm 1)\omega
(D) (8 \pm 2)\omega
Homework Statement
An experiment is done to measure the resistance of a wire.
The current in the wire is 1.0 \pm 0.2A and the potential difference across the wire is 8.0 \pm 0.4V.
What is the resistance of the wire and its uncertainty?
Homework Equations
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The Attempt at a...
Homework Statement
http://img100.imageshack.us/img100/1867/physicsp25wz8.png
Use data from Figure to determine,
(a) the distance traveled by the ball during the first 0.40s,
(b) the change in momentum of the ball, of mass 45g, during contact of the ball with the surface,
(c) the average...
Homework Statement
A steel ball of mass 73g is held above a horizontal steel plate, as illustrated in the figure below.
http://img59.imageshack.us/img59/3917/physicsp24bqd3.png
The ball is dropped from rest and it bounces on the plate, reaching a height h.
(a) Calculate the speed of ball as...
Homework Statement
A non-uniform plank of wood XY is 2.50m long and weighs 950N. Force-meters (spring balances) A and B are attached to the plank at a distance of 0.40m from each end, as illustrated in the Figure below
http://img266.imageshack.us/img266/2377/physicsp23bgh5.png [/URL]
When...
Homework Statement
A ball of mass 0.60kg rolls North at 4.0ms^{-1}. It meets a slope which causes a force of 0.18N East. This force lasts for 10s. Calculate the final velocity of the ball. Neglect any friction effects.
Homework Equations
F = m.a
v = u+at
The Attempt at a Solution
m = 0.60kg \...
Homework Statement
An aeroplane of mass 20 tonne lands on an aircraft carrier with a horizontal velocity of 80ms^{-1}. A 100m runway is available.
(a) What must be the acceleration to bring the aeroplane to rest safely?
(b) What retarding force is requires?
Homework Equations
v^2 = u^2 + 2as
F...
[SOLVED] Dynamics Question #3
Homework Statement
A ball of mass 0.20kg is dropped from a height of 2.5m and bounce back up to 1.6m. Taking the acceleration due to gravity as 9.81 ms^{-2}, calculate:
(a) the velocity of the ball as it hits the floor.
(b) the velocity of the ball as it leaves...
Homework Statement
An alpha particle is emitted from a stationary nucleus at 1.8 \times 10^7 ms^{-1}.The mass of the particle is 4u and that of the nucleus is 212u. (u is a unit of mass equal to 1.66 \times 10^{-27}kg.)
(a) Find the recoil velocity of the nucleus.
(b) Explain how you know the...