· A 8 kg wooden box is sliding on a leather covered desk with a kinetic frictional coefficient of 0.40. What is the Kinetic frictional force acting on the object?

The rigid beam is supported by the three suspender bars. bars ab and ef are made of aluminum and bar cd is made of steel. if each bar has a cross-sectional area of 450 mm2, determine the maximum value of p if the allowable stress is (σallow)st = 200 mpa for the steel and ( σallow)al = 150 mpa for the aluminum. est = 200 gpa and eal = 70 gpa.

If the wheels lock when braking suddenly the vehicle: a: loses traction b: lose steering wheel ability c: gain speed slightly d: gain steering ability

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?