Jack pushes on a large crate with a force of 75 N but it is not enough to make the crate move.  How much friction is present between the crate and the floor?

From the list below choose all statements that describe Cone Photoreceptors

You will use this problem for Questions 7 and 8.  Read carefully!  Free body diagrams will be graded in the written work. Mass 1 sits on a frictionless table, and mass 2 is attached to mass 1 by a string laid over a pulley as shown in the diagram. If a force of 10 N pulls on mass 1 as shown, (a) find the acceleration of the blocks and (b) find the tension in the string. For this question, enter the answer for part (a) – the acceleration of the blocks.

A physics student (m = 78 kg) takes a scale into an elevator to try to measure the acceleration of the elevator.  As the elevator begins to descend from rest, the scale measures the student’s weight as 577.2 N.  Find the acceleration of the elevator.  

You will use this problem for Questions 13, 14, and 15. Read carefully. A pumpkin is launched from the ground level and is aimed at a 10.7 meter tall cliff some distance away.  The pumpkin is launched with an initial velocity of 18 m/s at an angle of 55° and it lands 5 m past the edge of the cliff. (a) How long (in seconds) is it in the air before it lands on the top of the cliff?  (b) How far away (in meters) is the cliff? (c) Find the maximum height of the pumpkin.

Imagine looking out at a beautiful sunset behind trees on the horizon. Then you look down at your phone to read a text message. How do the lenses of your eyes accommodate (change) to view a closer object? 

The gravitational pull of the moon is 1/6 that of the earth (about 1.6 m/s2).  One object weighs 30 N on Earth.  A second object weighs 30 N on the moon.  Which object has the greater mass? 

Which has zero acceleration? An object at rest                                                                d.  a, b, and c moving at constant velocity                             e.  none of these in mechanical equilibrium

The ___________________ is a vascular membrane lining the outer surface of the eye and the inner surface of the eyelids

Which neurons tend to be adrenergic?