Determine what happens to the potential energy of a book as it drops from a desk to the floor. Indicate how convection currents depend on density differences. Please answer both, and thank you for your help and time.
It is August 1st and you are at a Science Camp in Florida. During an outdoor science quiz, you are asked to identify the temperature scale for a thermometer that reports the current temperature as 90. Is this thermometer calibrated for the Kelvin, Fahrenheit, or Celsius temperature scale?
A chemist notices some silvery liquid on the floor in her lab. She wonders if someone accidentally broke a mercury thermometer, but did not thoroughly clean up the mess. She decides to find out of the silver stuff is really mercury. From her tests with the substance, she finds out that the melting point for the liquid is 275 K. A reference book says that the melting point for mercury is -38.87°C. Is this substance mercury? Explain your answer and show all relevant calculations.
The height of a flagpole is 8.5 meters tall. If the length of the meter stick shadow is 1.5 meters long, what would be the length of the flagpole’s shadow?
Two blocks of masses 6 kg and 5.5 kg are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them. A cord holding them together is burned, after which the block of mass 5.5 kg moves to the right with a speed of 6.8 m/s. What is the velocity of the other mass in m/s? Answer in units of m/s
a 20N mass is supported by two ropes. what is the tension in each rope? how woould i work this problem if i know the two angles and thats the only info i know.
A force of 2170 N is needed to bring a car moving at 24.3 m/s to a halt in 17.2 s. What is the mass of the car? Answer in units of kg.
An electrical kettle uses 18A of current to boil 500ml of water. What is the electrical resistance of the kettle in ohms?
