Blog

As shown in Fig. 2, a proton is projected with speed 3 . 90 × 10 6   m s into a region with a uniform electric field parallel to the velocity of the proton and then enters a region with a uniform magnetic field which is perpendicular to the proton velocity with a magnitude B → = 0 . 300   T . Both the width of the electric region and the width of the magnetic region are 20 . 0   c m . If the surface charge density of the left large plate in the electric field region is 6 . 00 × 10 – 6   C m 2 and the surface charge density of the right large plate in the electric field region is – 6 . 00 × 10 – 6   C m 2 , (a) what is the speed of the proton when it exits from the region of the electric field; (b) what is radius of path of the proton after it enters the region of magnetic field; (c) how much time does the proton stay in the region of the magnetic field; and (d) what are the x and y components of the velocity of the proton when it exits the magnetic region? If the magnitude of the magnetic field can be changed, (e) what is the magnitude of the magnetic field if the incoming proton exits the region of magnetic field in a direction opposite to its incoming direction? (mass of a proton= 1 . 67 × 10 – 27   k g ; charge of a proton= 1 . 60 × 10 – 19   C ) fig_q18_final.jpg                                                                 Fig. 2.1                                                                                                                                                                                                                                     Fig. 2.2

You are attempting to assess a patient’s cervical rotation strength. He is unable to perform the motion against gravity. The correct position to complete the test would be:

Mrs. P underwent (R) total hip surgery last week. You have been working on exercise, and gentle stretching activities with her and she is making excellent progress. The supervising PT has asked you to take goniometric measurements and MMT’s of her (R) leg. Prior to today’s session, you notice that the IV in the (R) dorsum of her hand has infiltrated. Is it safe for you to proceed with assessment as planned?

A patient enters the clinic after sustaining a whiplash injury in an automobile accident. His injury occurred with the neck in hyperextension, thus tearing the musculature on the front of the neck.  Which of the following muscles are involved in the injury?

You are observing the posture of a patient and notice that she presents with forward posture and rounded shoulders.  Of the following, which muscles do you think will present with weakness upon MMT?

A physical therapist assistant attempts to passively stretch a patient’s rectus femoris. The MOST effective position to stretch this muscle is_____?

You have just seen a patient who has a torn supraspinatus tendon. In which of the following motions would you expect weakness to be demonstrated?

A patient presents to labor and delivery triage with a male partner at her bedside. The patient is hesitant, avoiding eye contact with the nurse and looking to her partner for answers to any questions. Her left cheek has a visible bruise that is purple in color. List the actions that the nurse would take when suspecting abuse. (Select all that apply)

The Multiple-Repetition Maximum Test assesses the number of repetitions the patient is able to perform with a selected weight until the point of muscle failure.

Weakness in ankle dorsiflexion shows involvement of which level?