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rms value of i= 10 sinwt + 20 cos (wt + 30°)
Two crates with masses of 100 kg and 200 kg respectively are connected with a light inelastic rope. A force with magnitude F pulls the crates up an incline with an angle of 30° with the horizontal
The kinetic coefficient of friction for the 100 kg crate is 0,3 and that of the 200 kg crate is 0,5.
Calculate the Magnitude of F if the system moves at a constant velocity up the
incline.
Spectra of Bohr's Atomic Model
Kelebogile and Thabiso want to move a crate in a classroom.
Kelebogile initially pulls the crate with a force of 80 N to the right and Thabiso pulls the crate with a force of 50 N to the left as shown in the diagram below. Ignore all effects of friction.
What is the net force exerted on the crate?
Energy level of Bohr's Atomic Model
Limitations of Bohr's Atomic Model
The earth exerts a gravitational force of 1,9 x 1020 N on the moon. The mass of the moon is 7,4 x 1022 kg and its radius is 1,74 x 106 m.
An astronomer that weighs 20 kg on earth, lands on the moon. What would his mass be on the moon?
The earth exerts a gravitational force of 1,9 x 1020 N on the moon. The mass of the moon is 7,4 x 1022 kg and its radius is 1,74 x 106 m.
Calculate the distance between the centres of the earth and the moon.
(MEarth = 6 x 1024 kg)
Calculation of Bohr's atomic model of energy of electron in nth orbit.
The earth exerts a gravitational force of 1,9 x 1020 N on the moon. The mass of the moon is 7,4 x 1022 kg and its radius is 1,74 x 106 m.
Calculate the magnitude of the gravitational acceleration on the moon
