Evolution by natural selection works best on a population having no variation.

Which genotype below is heterozygous?

Burl and Paul have a total weight of 1300 N. The tensions in the supporting ropes that support their scaffold add to 1700 N. The weight of the scaffold itself must be

A 13 kg grocery cart is rolling down the street with a velocity of 2.0 m/s. Part A) What is the momentum of the grocery cart? To answer the question please write down the equation in variable form, fill in the equation,  and then give your answer with the correct units. 

A 20.0 kg shopping cart is pushed with an applied force of 75 Newtons. There are 15 Newtons of friction.  Part A) What is the net force acting on the grocery cart?  To answer the question please show your work and then your answer with the correct units. 

A 20.0 kg shopping cart is pushed with an applied force of 75 Newtons. There are 15 Newtons of friction.  Part B)What is the acceleration of the grocery cart?  You will need to use the answer from the previous question. To answer the question please write down the equation in variable form, fill in the equation,  and then give your answer with the correct units. 

If the mass of a cart is tripled, the cart’s acceleration

If a car increases its velocity from zero to 60 m/s in 10 seconds, its acceleration is

Katelyn runs backward along the aisle of a train that moves forward at 8 m/s. Her speed relative to the floor is 3 m/s. Her speed relative to an observer at rest on the ground is

The force of friction on a sliding object is 20 N. The applied force needed to maintain a constant velocity is