A class is performing an experiment to keep an ice cube solid as long as possible. What students actions could be a source or error in this experiment

A. Jerrie wrapped the ice cube loosely in several layers of cotton and
aluminum foil.
B. Carey put the ice cube in cold water and recorded the temperature
every 2 minutes as the ice cube melted.
C. Jody outlined the ice cube to measure it before it started to melt.
D. Angelina waited until the next day to observe the ice cube and
record how long it took to melt.

Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.

Which sound characteristic is not affected by the relative motion of an object

Avector a⃗ has a length of 8.6 m and points in the negative x direction. find the x component of the vector −3.7a⃗ .