A train travels 53 kilometers in 1 hours and then 81 kilometers in 3 hours what is its average speed?

What is outside confirmation

When a certain spring is expanded 6 centimeters from its natural position and held fixed, the force necessary to hold it is 1200 dynes. Find the work W required to stretch the spring an additional 6 centimeters

A car traveling at 70 mph70 mph down the interstate collides with a bug trying to cross the highway. Which of the following statements best describes this collision? The car exerts a smaller force on the bug than the bug exerts on the car.

Which concept was supported by taking measurements of the same stars at night and then again during solar eclipses?

A 58.1 kg wood board is resting on very smooth ice in the middle of a frozen lake. A 48.3 kg boy stands at one end of the board. He walks from one end of the board to the other end with a velocity of 1.

A taxi hurries for 1 3/4 hours with a constant speed of 84 mph and then for another 1 hour 45 minutes with a constant speed of 24 mph. what is its average speed for the total trip?

A carbon atom has how many valence electrons?

X-rays UV light waves Sound waves Earthquake waves. All of these have which characteristic in common?

V=345m/s, 7210Hz, X=?

As a mercury atom absorbs a photon of energy, an electron in the atom changes from energy level d to energy level e. Determine the energy of the absorbed photon in electronvolts.