Which of the following best describes what went wrong with the scientists' study? an improper experimental procedure the lack of a control group selection bias human error

Is there a link between the number of bulbs and current drawn from the power pack?

In which of the following would you expect the best transmission of light? a. hot gas b. a glass of very cold liquid c. an object in the solid state d. colored cloth

The lightning bolt discharge lasts one millisecond. What is the average current flowing from the cloud to ground? Answer in units of A.

From which sphere does most water evaporate? A. Lithosphere B. Hydrosphere C. Biosphere D. Atmosphere

What is tension? a. stress squeezing an object c. stress breaking an object b. stress pulling an object d. stress releasing an object

What units are used for gravitational potential energy? Write the name, not the symbol.

A 7.5 kg block is placed on a table. If it's bottom surface area is 0.6m2, how much pressure does the block exert on the tabletop? A. 376.5 Pa B. 73.5 Pa C. 226.5 Pa D. 122.5 Pa

A boulder of mass 2000 kg is at the top of a cliff of height 220 m. Determine how fast the boulder will be moving when it strikes the dirt below.

Which of the following statements are true? Check all that apply. O A positive charge and a negative charge attract each other. O Electric charge is conserved. O Two positive charges attract each other. O A neutral object contains no charge.

You push a shopping cart filled with groceries (total mass = 20 kg) by applying a force to the cart 30° from the horizontal. if the force you apply has a magnitude of 86 n, what is the cart's acceleration? assume negligible friction.