The answer is 127.04g. I’m getting close but can’t get the answer.
Using 9.81 for gravity, the force where the balance is is 2.10(58146)N
As it is balanced
2.10N x 0.29m = W x 0.50m where 0.50 is the centre of mass
That gives W = 1.22N
An electric circuit consists of 3 identical resistors of resistance R connected to a cell of emf E and negligible internal resistance. What is the magnitude of the current in the cell? (in the diagram two of the resistors are in parallel with each other then the other in...
The magnetic field that is oriented perpendicularly through a 9.2 cm diameter coil of wire drops from 6.4 T to 6.1 T in 0.076 seconds. What is the emf induced in the coil?
Trying to answer this. My question is, if they are perpendicular then does that mean that cos90 makes phi = BAcos theta...
Problem: a car is moving away from a stationary observer at 25ms^-1. It emits a frequency of 810Hz and the observer hears an apparent frequency of 762Hz. What is the speed of sound in air at that time?
The equation for a source moving away is
Please could someone check if I have got this right? Many thanks
The question: An object of mass of 1000kg leaves a 64m high cliff at 100 ms-1 before descending to the ground. Ignoring air resistance, determine its speed immediately before landing.
Trying to work out how to do this. I know the answer is B but don't know how.
Internal resistance is negligible so I assume I just use I =V/R. I've tried using sample values for R eg 5 and V =10V giving I as 1.3 but am no closer to 2/3. What am I missing?
I'm revising attenuation and power loss logarithmic equations.
The exam formula I'm given is attenuation = 10 log (I1/I2)
I'm trying to confirm what each I stands for.
Some of the examples I'm looking at seen to give input/output power, some seem to reverse it. Which is right? What do they...
Lucy stands on the edge of a vertical cliff and throws a stone vertically upwards. The stone leaves her hand with speed 15m/s at the instant her hand is 80m above the surface of the sea. Air resistance is negligible and the acceleration of free fall is 10m/s/s.
First part is to calculate the...
Two lengths, a and b, are measured to be 51+/-1cm and 49+/-1cm respectively. In which of the following is the percentage uncertainty the largest?
C a x b
The answer should be b but I can't figure out why. I know that for / and x you add the percentage errors so if the error...
Thanks for your help but I still don't understand. The answer is D but I can't see how you would know that with no numbers apart from the charges. I've tried calculating E using sample distances and get no where near zero. I want to understand the physics and the algebra but neither are making...