A 21 kg child is riding a 5.9 kg bike with a velocity of 4.5 m/s to the northwest.

a. What is the total momentum of the child and the bike together?

b. What is the momentum of the child?

c. What is the momentum of the bike?

Which of the following is NOT an effective pre-exercise energizing snack?

Reggie and Charlotte are baking oatmeal cookies. They dip the baked cookies in melted chocolate. The chocolate cools to form a hardened coating. Reggie argues the entire chocolate-covered cookie has undergone a chemical change.

Alejandra weighs 225 newtons. how much work does she do against gravity when she climbs to a ledge at the top of a 15 meter climbing wall

If a 1-megaton nuclear weapon is exploded at ground level, the peak overpressure (that is, the pressure increase above normal atmospheric pressure) will be 0.2 atm at a distance of 6 km. Atmospheric pressure is 1.013 * 10^5 Pa.

What is the time lapse between seeing a lightning strike and hearing the thunder if the lightning flash is 47 km away? The speed of light waves in air is 3 * 108 m/s and the speed of sound waves in air is 333 m/s.

What is the average speed in miles per hour of the car that traveled a total of 200 miles in 5.5 hours

A solid weighs 277.5 g in air and 212.5 g when totally immersed in the liquid of density 0.9 g / cc. Calculate the density of the solid.

Who first described the double-helix structure of DNA?

Suppose you are holding a basketball while standing still on a skateboard you are and the skateboard have a mass of 50 kg you throw the basketball with a force of 10 N what is your acceleration before and after you throw the ball

Which nitrogen base sequence is the partner of C-A-T-C-G-A? O C-A-T-C-G-A O G-T-A-G-C-T OT-G-C-T-A-G O G-C-A-T-G-T TI