The products of a chemical reaction can never have greater mass than the reactants

true or false

What is meant by power rating of an appliance? A bulb is rated as 60 W, 220V. What does itindicate?

While sleeping, a 15.5 kg dog exerts a downward force on the ground. What is the magnitude of the upward force being exerted on the dog by the ground?

Which of the following is a type of wave that does not need a medium though which to travel? A. Equilibrium B. Longitudinal C. Amplitude D. Transverse

A car sits in an entrance ramp to a freeway, waiting for a break in the traffic. The driver sees a small gap between a van and an 18-wheel truck and accelerates with constant acceleration along the ramp and onto the freeway.

You need to lift up a 45-N object. Explain the strength and direction of the force used to lift the object.

A sound from a source has an intensity of 270 db when it is 1 m from the source. what is the intensity of the sound when it is 3 m from the source?

What experimental term is it when a ruler is dropped to the floor?

Where is most of the energy from incoming waves focused? A. spit B. headland C. underwater D. barrier beach

Exoplanets (planets outside our solar system) are an active area of modern research. Suppose you read an article stating that there is a newly discovered planetary system with three planets.

A car with a mass 1200 kg accelerates at 1.89 m/s2. What is the total force exerted by the car on the road (answer in N to two decimal places) ?