Which of these is an example of a chemical change?

a. leaving cheese out to get moldy

b. smelling sprayed perfume

c. feeling ice melt on your skin

d. crushing ice with a hammer

The ammeter displays a reading of 0.10 A. Calculate the potential difference across the 45 Ω resistor.

A spring stores 68 j of potential energy when it is stretched by 6 cm

A grating whose slits are 3.2x10^-4 cm apart produces a third-order fringe at a 25.°0 angle. What is the wavelength of light that is used?

A jackhammer is causing vibrations in a wall that is connected to the concrete being jackhammered. When the hammer is stopped, the wall ceases to vibrate. This type of vibration is: resonance forced vibration an example of beats none of the above

Joan is setting up an experiment in the lab to observe newton's second law of motion. she has a model car that has a mass of 45 kg, and it is accelerating at 7 m/s/s. she then increases the acceleration to 28 m/s/s.

An object weighing 1.840 kg has a volume of 0.0015 m3. What is the density of the object in g/cm3?

What is the purpose of cooking using sunlight?

Two planets of the same mass are observed. Which of the following distances between the two planets would result in the least gravitational attraction? A. 90 light years B. 80 light years C. 60 light years D. 50 light years

How would you make a structure stronger?

What object would absorb the most light