Search & Filtering
A constant force of 245 N is applied at a 48.2° angle to a mass of 62.1 kg as shown below. If the mass moves at a constant speed of 3.28 ms–1, determine its coefficient of dynamic friction.
Ans:0.206
Suppose a laser starting an original field strength Eo bounces back and forth between two mirrors with reflectivity R1 and R2 . The field makes a round trip in a time T = 2L / v , where v is velocity . The electric field will decay with time and the decaying field will be?
A spring with a spring constant of 25 N/m is stretched 65 cm. What was the magnitude of the force used?
An electric wire in the wall of a building carries a current of 25A vertically upward. What is the magnetic field due to this current at point P 10cm due north of the wire
A 100 kg wooden crate is at rest on a level stone floor. If the coefficient of static friction is 0.5. what is the minimum horizontal force needed to get the box moving
Oxygen ( molecular weight 32) is compressed reversibly and polytropically in a cylinder
from 1.05 bar, 15oC to 4.2bar in such a way that one- third of the work input is rejected
as heat to the cylinder walls . calculate the final temperature of the oxygen. Assume
oxygen to be a perfect gas and take Cv = 0.649kJ/kg.K
0.05 kg of carbon dioxide (molecular weight 44), occupying a volume of 0.03m3 at
1.025bar , is compressed reversibly until the pressure is 6.15bar. calculate the final
temperature the work done on the CO2 and the heat flow to or from the cylinder walls ,
1- when the process is according to the law p.ν1.4 = constant , 2- when the process is
isothermal , assume carbon dioxide to be a perfect gas , and take γ = 1.3
Is sitting on a chair considered work
A 10 kg block is allowed to slide down a frictionless 600 incline. What is the block's acceleration?
take g = 9.8m/s2
A body with mass 600 kgis located on a 30 degressinclined plane. Calculate the pulling force without friction.
take g = 9.8m/s2
