Which of the following measurements of a mass is the most precise?

For an experiment in this unit, you need to calculate the kinetic energy of a cart. You measure the mass of the cart to be 0.100 ± 0.003 kg and the speed of the cart to be 2.45 ± 0.02 ms^-1. What is the absolute uncertainty in the kinetic energy of the cart (to 1 sig fig) calculated from these values?

In an experiment for this unit, theory predicts that the speed of a cart, after rolling down a slope, will be 3.40 ± 0.08 ms^-1. Your repeated measurements of the speed gives a value of 3.7 ± 0.1 ms^-1. Are your measurements consistent with the theory?

In an experiment for this unit you measure the length of a piece of paper as 9.6 ± 0.05 cm. You can assume the likelihood the “true value” of the length lies between 9.55 cm and 9.65 cm is:

Which of the following measurements of a time period is the most precise?

You use a stopwatch to take repeated measurements of the time it takes a ball, from rest, to roll a fixed distance down a slope. As your best estimate of the time the ball actually takes to roll this distance you should use:

Which of the following measurements of a weight is the most precise?

A force of 3 N acts to the right on an object, while the object is displaced along a straight line resulting in the object moving 4m to right as it moves 5 m up.

How much work does gravity do on the object during this displacement if the object has a mass of 2 kg. 

Please enter your answer in J, but do not type the units. Also note you may use g=10m/s².

A force of 3 N acts to the right on an object, while the object is displaced along a straight line resulting in the object moving 4m to right as it moves 5 m up.

True or False:

A force of 3 N acts to the right on an object, while the object is displaced along a straight line resulting in the object moving 4m to right as it moves 5 m up.

What is the work done by the 3 N force?

Give your answer in J, but do not write the units.