In which of these reactions is energy released? A. endothermic reactions B. exothermic reactions C. no reactions D. all reactions

Paul bought a student discount card for the bus The card allows him to buy daily bus passes for a $1.50 after 1 month Paul bought 15 passes and spent a total of 29.50 how much did he spend on the student discount card

A car traveled 60 km in two hours, 84 km in the next one hour, and then 68 km in two hours before reaching its destination. What was the cars average speed? Rounded to the nearest whole number. A. 212 km/HR B. 42 km/HR C. 148 km/HR D. 1060 km/HR

A spherical ball is immersed in water contained in a vertical cylinder. The rise in water level is measured in order to calculate the radius of the ball.

A boy pedals his bicycle with a net horizontal force of 235 N. If the total mass of the boy and the bike is 40 kg, how much are they accelerating

What is the deflection of a spring? A ball of mass 2kg is dropped from a height if 20cm on a spring of stiffness k=1225 N/m. Find the maximum deflection of the spring.

7. What type of mineral can scratch glass, but cannot scratch steel? A. Gypsum B. Diamond C. Feldspar D. Fluorite

What factors determine the electrostatic force between two objects?

How many watt-hours does a 80 watt light bulb use if it runs for 3.5 hours?

A series circuit contains two devices, one with a resistance of 10 ohms and one with a resistance of 4 ohms. If the generator supplies a voltage of 42 V, what is the magnitude of the current? A. 2 A B. 3 A C. 1.75 A D. 1.33 A

What is the relationship between speed and the slopes of the lines on a graph