Homework Statement
A person has 300 g of black coffee at temperature 350 K in a vacuum
flask. 100 g of milk at 280 K are added to the coffee (the flask is immediately closed, so the loss of heat to the air is negligible). Assuming that the specific heat capacities of the coffee and milk are...
Field lines are a visual representation of a vector field.
The lines represent the direction, and strength of the field. In an electric field field
lines flow from a positive charge and into a negative charge, in the case of a
gravitational field field lines start at infinity and end at a mass...
Homework Statement
A stream of 100 eV electrons, each with speed v = 5.9 × 106 ms−1, traveling horizontally along the x-axis in the positive x-direction enters a region pervaded by a uniform magnetic field B. The electrons then describe a circle with radius R in the horizontal xy-plane...
Homework Statement
Two charges Q1 and Q2 of equal magnitude but opposite signs are fixed a distance 5.00 m apart in a vacuum The line PQ is a 12.0 cm section of the line joining the two charges and is placed centrally between them. Over the distance PQ the electric field may be taken to be...
Homework Statement
A horizontal disc of diameter 12.0 cm is spinning freely about a vertical axis
through its centre at an angular speed of 72 revolutions per minute. A piece
of putty of mass 5.0 g drops on to and sticks to the disc a distance of 4.0 cm
from the centre. The angular speed...
Ok I am no expert but perhaps I can help a little. From the wavelengths determine which part of the electromagnetic spectrum the light is then you can see if the star is red shifted or blue shifted ie moving away or nearer.
Homework Statement
I need to work out g for a pendulum. I have values for length (l) and time (T^2)
Homework Equations
T= 2 pi sqroot (l/g)
The Attempt at a Solution
I have plotted a graph of T^2 against l found the gradient of the line is this the value for g or if not do I need...