Describe how the doppler effect explains why an approaching fire engine's siren has a high pitch?

A bullet of mass 20g strikes a block of mass 980g with a velocity u and gets embedded in it. The block is in contact with a spring whose force constant is 100N/m. After the collision the spring is compressed to 10cm. Find: 1.

Which landform is with steep sides and flat top that rises hinge into the air?

How many atoms are there in 1cm^3 of a solid?

List the metric base units for the following: c. Length: d. Distance: e. Mass: f. Temperature:

An object with a mass of 70 kilograms is supported at a height 8 meters above the ground. what's the potential energy of the object with respect to the ground. A. 2,058 j B. 5,488 j C. 560 j D. 3,430 j

200 525000 lololo Boat A is 10 km north of a port. Boat B is 5 km east of the same port. Boat A sails in a straight line towards boat B. Work out the bearing on which boat A sails.

Is Li greater than He on the periodic table?

White light falls on a yellow filter, if: (a) A green filter is placed behind a yellow filter, what is the colour of the light that will emerge from the green filter?

Calculate the energy equivalent in joules of the mass of a proton. [Show all work, including the equation and substitution with units.]

If the weight is 950 newtons, what is the mass?