Your go-cart breaks down right before the end of a race, so you have to push it over the finish line. the go-cart has a mass of 85 kg.

a. what is the weight of your go-cart?

b. how much force must you apply to give the go-cart an acceleration of 0.9 m/s^2

c. if you push with a force of 350 n, what is the acceleration of the cart?

d. later, you are driving your friend's go-cart. if his cart has an acceleration of 5.5 m/s^2 and the cart's engine is applying a forward force of 720 n, what is the mass of his go cart?

a) W=mg=833 N by definition

b) F=ma=76.5 N according to Newton's second law

c) a=F/m=4.12 m/s^2

d) m=F/a=720/5.5=130.91 kg

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2