Ms. sullivan's class is investigating simple machines. today they are using a crowbar to lift a heavy desk. most students can lift the desk with the crowbar, even though they couldn't lift it with their bare hands.

one student in the class can't lift the desk even with the crowbar. what change should be made so the student can lift the desk?

a) use a crowbar that is longer than the first.
b) use a crowbar that is shorter than the first.
c) use a crowbar that is heavier than the first.
d) use a different type of lever that is the same length as the original crowbar.
eliminate

Asubject in a clinical research trial experiences a serious, unanticipated adverse drug experience. how should the investigator proceed, with respect to the irb, after the discovery of the adverse event occurrence? a. do not report the adverse drug experience to the irb since it is a common adverse experience.b. report the adverse drug experience to the irb only if there are several other occurrences.c. report the adverse drug experience as part of the continuing review report.d. report the adverse drug experience in a timely manner, in keeping with the irb's policies and procedures, using the forms or the mechanism provided by the irb.

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?

Aheavy piece of hanging sculpture is suspended by a90-cm-long, 5.0 g steel wire. when the wind blows hard, the wire hums at its fundamental frequency of 80hz. what is the mass of the sculpture?