Which of these example would illustrate that work in being done? A) an airplane sits on the runway ready to takeoff B) a weightlifter attempts to pick up the barbell, but it does not move C) a construction worker pushes on a concrete wall until he becomes exhausted D a high school freshman lifts a backpack full of textbooks onto her shoulder

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

Avery long solenoid of inner radius 2.75 cm creates an oscillating magnetic field of the form = for this solenoid, =0.00425 t and =319 rad/s. (a)what is the maximum value of the induced electric field at a perpendicular distance 1.45 cm from the axis of the solenoid? (b) what is the maximum value of the inducted electric field at a point 5.85 cm perpendicular from the axis of the solenoid?

Anika asks eva to roll a basketball and then a bowling ball to her. which requires more force to roll, and why?