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Mechanics | Relativity
A metre rule is balanced on a knife edge at it's centre of gravity G . A mass of 40g is placed at a distance of 30cm from G and another mass x g placed at 10cm from G on the other side kept the ruler in equilibrium. What is the value of x
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Mechanics | Relativity
Why we cannot travel faster than light?
Mechanics | Relativity
A pack of 25 kg with wooden roofs in 1 man has a 35 slope
pushing it to the roof. Between previously installed wooden roof coverings and the package
The kinetic friction coefficient is 0.32. 0.2 m / s2 of the package
up the roof with the acceleration
Find the force required to push it. (Take g = 9.8 m / s2.)
pushing it to the roof. Between previously installed wooden roof coverings and the package
The kinetic friction coefficient is 0.32. 0.2 m / s2 of the package
up the roof with the acceleration
Find the force required to push it. (Take g = 9.8 m / s2.)
Mechanics | Relativity
Show the efficiency E the force ratio (MA)and the velocity of a machine are related to the equation
E= MA/VR × 100
E= MA/VR × 100
Mechanics | Relativity
If an object of mass 4kg goes round a circle of a radius 0.5m in 3.142, what is the force towards the centre(π=3.142)
Mechanics | Relativity
A metal rod of length 15 cm is heated to 38 °C. If the length of rod expands to 15.12 cm after some time, calculate the coefficient of linear expansion (Room temperature is 27 °C).
Mechanics | Relativity
A rectangular block of metal of 50 mm x 25 mm cross-section and 125 mm length carries a tensile load of 100 kN along its length, a compressive load of 1.0 MN on its 50 x 125 mm faces and a tensile load of 400 kN on its 25 x 125 mm faces. If E = 208 GN/m² and Poisson’s ratio = 0.3, Find (a) change in volume of bar (b) increase required in 1.0 MN load to produce no change in volume.
Mechanics | Relativity
Blocks A and C are connected by a string as shown. When released, block A accelerates to the right and block C accelerates downward. There is friction between blocks A and B, but not enough to prevent block B from slipping. If you stood next to the table during the time that block B is slipping on top of block A, you would see A. block B accelerating to the right. B. block B accelerating to the left. C. block B moving at constant speed to the right. D. block B moving at constant speed to the left.
Mechanics | Relativity
When electric power is to be transmitted over long distances, is it economical to use high voltage and low current or low voltage and high current? Briefly explain your choice
Mechanics | Relativity
A researcher collected the following information for two variables x and y
No. of pairs = 20, r = 0.5, mean of X is 15, mean of Y is 20, standard deviation of X is 4,
standard deviation of Y is 5.
Later on it was found that one pair of value as been wrongly taken as (X = 16, Y = 30) whereas
the correct values were (X = 26, Y = 35). Find the correct value of r.
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#340153 on Dec 2023
#340153 on Dec 2023