Aspherical pot of coffee contains 0.50 l of liquid at an initial temperature of 80°c. the pot has an emissivity of 0.40, and the surroundings are at a temperature of 20°c. calculate the coffee’s rate of heat loss by radiation. use σ = 5.67 × 10–8 w/(m2 • k4).
a.
6.1 w
b.
4.9 w
c.
3.0 w
d.
5.6 w

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.

Drag each item into the proper state of matter category.

Suppose an objects initial velocity is 10m/s and it’s final velocity is 4 m/s. mass is constant. what can best be concluded about the object based in the work-energy theorem