Blog

A skier starts from rest and slides down a frictionless slope. The slope is 15 m long and makes a 25° angle with the horizontal. What is the skier’s speed at the bottom of the slope?

How would a spinning object’s kinetic energy change if its moment of inertia were 5 times larger but its angular speed were 5 time smaller?  

A 180 cm long bar has a cross-sectional area of 1.8 × 10-4 m2. A force of 2.2 × 104 N applied to each end increases the length of the bar by 1.2 mm.  This is an example of what kind of strain?

A truck with a translational speed of 15.0 m/s rounds a curve with a radius of 6.50 m. Calculate the angular speed (units: radians per second).    NOTE: Watch correct use of rounding and significant figures Enter numerical answer in proper decimal format, not scientific notation Do not enter units with the answer  

A 1.25 × 103 g object is moving at 11.5 m/s. Calculate the momentum of the object (units: kg⋅m/s)?   NOTE: Watch correct use of rounding and significant figures Enter numerical answer in proper decimal format, not scientific notation Do not enter units with the answer  

Dave accelerates a box across a smooth friction-less horizontal surface over a distance of 15.0 m with a constant 25.0 N force angled at 38.0° above the horizontal. How much work (units: J) does Dave do on the box? NOTE: Watch correct use of rounding and significant figures Enter numerical answer in proper decimal format, not scientific notation Do not enter units with the answer  

Dave accelerates a box across a smooth friction-less horizontal surface over a distance of 15.0 m with a constant 38.0 N force angled at 25.0° above the horizontal. How much work (units: J) does Dave do on the box? NOTE: Watch correct use of rounding and significant figures Enter numerical answer in proper decimal format, not scientific notation Do not enter units with the answer  

If   find dy/dx   Click ‘True’ when finished

Show how to find the derivative of tan (x). You must use the limit definition of the derivative for this problem.   Click ‘True’ when finished

Evaluate the following derivative:     Click ‘True’ when finished