1. A force acting on an object does no work if

A a machine is used to move the object

B the force is not in the direction of the object's motion

c the force is greater than the force of friction

What is one way elements in the periodic table are arranged? a. in numerical order, heaviest first b. in alphabetical order C. in order of atomic number d. in order of number of neutrons

1 Robert throws a frisbee to Grace, who is 50m away. It reaches her in 5s. What was the speed of the frisbee? Include the correct units in your answer.

A 9V battery is directly connected to each of 3 LED bulbs. Select the statement that accurately describes this circuit.

Estimates of temperature at any given location on Earth based solely on the intensity of solar radiation will be: slightly overestimated at the poles because ice at the poles reflects heat.

The rubidium isotope 87Rb is a β emitter that has a half-life of 4.9 ✕ 1010 y that decays into 87Sr. It is used to determine the age of rocks and fossils. Rocks containing the fossils of early animal have a ratio of 87Sr to 87Rb of 0.0040.

How big is a wifi pulse signal coming from your router? A) 10 meters B) 15 meters C) 5-10 meters D) 20-30 meters

Imagine you are in a music concert. What different sounds might you hear? How are these sounds made?

Dose aloe Vera grow in the mesa?

A tradesman sharpens a knife by pushing it against the rim of a grindstone. The 35 cm diameter stone is spinning at 200 rpm and has a mass of 28 kg. The coefficient of kinetic friction between the knife and the stone is 0.20.

What is the unit for force we use when calculating F=ma?