Fall 2020 Mechanics, Heat and Sound - Collins M (CollinsMPHY1) / Exam_6M 20 Administer
6. 10 pts possible
A large tank filled with water has two holes
in the bottom, one with twice the radius of the
other. In steady flow the speed of the water
leaving the larger hole is the speed of
the water leaving the smaller.
1. the same as
2. half
3. four times
4. one fourth
5. twice

Which statement best describes resistance? resistance is a. how well a current will flow in a material and is measured in volts. b. how well a material conducts an electrical charge and is measured in ohms. c. the ability of a material to attract a positive charge to create a current. d. the ability of a material to repel neutral charges and is measured in ohms.

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

What is the role of lenses in microscopy?