Find the volume of a cylinder with radius 8cm and height 10 cm, correct to 2 decimal places.
1 answer:
Answer:
Step-by-step explanation:
The formula for the area of a circle is :
To work this out you would first have to work out the area of the circle. You can do this by multiplying pi by 8 squared, this gives you 201.06. This is because in order to calculate the volume you must calculate the area of one face of the shape.
The next step is to multiply 201.06 by 10, this gives you 2010.62.
1) Multiply pi by 8 squared.
2) Multiply 201.06 by 10.
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Answer:
Here's what I get
Step-by-step explanation:
The atomic model before Chadwick
J. J. Thomson had discovered the electron in 1897 and Rutherford discovered the proton in 1912.
So, in the 1920s, scientists thought that a helium atom (₂⁴He), for example, consisted of four protons, two electrons orbiting the nucleus, and another two electrons in the nucleus to balance the charge.
In 1932, Irène and Frédérick Joliot-Curie discovered that when α particles hit a Be target, a strange radiation was emitted that could knock protons out of paraffin. They thought it was some type of high-energy X-rays
Chadwick's experiment
Chadwick thought the radiation consisted of particles, not X-rays. He repeated the Curie's experiment and carefully measured the velocities of the scattered protons.
Using the Laws of Conservation of Energy and Momentum, he calculated that the radiation hitting the paraffin must consist of neutral particles with a mass slightly greater than that of a proton.
Chadwick had discovered the neutron.
The atomic model after Chadwick
Chemistry now made more sense. A helium atom now consisted of two electrons orbiting a nucleus containing two protons and two neutrons. There was no need to have electrons in the nucleus.
