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A quantity is measured 100 times, and, after calculating the mean, the standard deviation, and the standard error on the mean, and assuming the errors on the individual measurements are all random, you come to the conclusion that your best value, and standard error on the mean, are X = 21.0 +/- 0.4
This is fine, but you'd really like to have a final accuracy of 0.1 cm. So you take more measurements. Assuming that in the second bunch of measurements, any given measurement has about as much random error as any given measurement in your original 100 measurements, how many measurements should you make, in total, so that the standard error on the average of all your measurements is 0.1 cm
The potential difference between the accelerating plates of a TV set is about 25 kV. If the distance between the plates is 1.5 cm, find the magnitude of the uniform electric field in the region between the plates.
The planet Neptune orbits our Sun at an average distance of 4.50 * 10^9 km.It's mass is 1.02 8 10^26 kg. The Sun's mass is 1.99 * 10^30 kg. What is the strength of the gravitational field at the "surface"of Neptune
Consider a regular hexagon of side length, L=10cm. A charge, Q=2uc, is located at each vertex(there are 6). find the electostatic potential at the center of the hexagon
What is the saturation activity of 24Na that can be induced in a 400 g sample of NaCl with a constant thermal-neutron fluence rate of 5 x 1010 cm-2 sec-1
It is found that a uniform amount of electrical flux is going through each region of a Gaussian surface shaped like a cube. What amount of charge is there inside the sphere
A girl with mass m1 and a sled with mass m2 are on the frictionless ice of a frozen lake, How far from the girl's initial position do they meet
An aluminum cup contains 225 g of water and a 40-g copper stirrer, all at 27°C. A 500-g sample of silver at an initial temperature of 85°C is placed in the water. Calculate the mass of the aluminum cup
a block mass 15.92kg supported by a vertical massless cable is initially at rest. The block is then pulled upward with a constant acceleration of 2.11m/s^2. What is the tension in the cable
a circular loop of wire of radius 0.50 m is in a uniform magnetic field of 0.30 t. the current in the loop is 2.0 a.
A projectile is launched horizontally from a 30 m high cliff with a speed of 40.0 m/s. How far from the base of the cliff does the projectile hit the ground
a plane locked on cruise control flying due east at 300ms but its resultant velocity is 300.66ms at 3.8 south of east.
A transformer with 1710 turns on the primary and 229 turns on the secondary is used in an electric slot car racing set to reduce the input voltage amplitude of 170 V from the wall output
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