Assume that block a which has a mass of 30kg is being pushed to the left with a force of 75n along a frctionless surface. what is the friction for of block a on block b if thw block b has a mass of 24 kg and is accelerating at 0.50m/s2 to the right relaitve to the block a?
weight
normal force of the ground, weight
friction of the road, the normal force of the ground, force of the ground against the wheels pushing the car forward, weight

What are the three ways that an object can accelerate

Thomas his older brothers, who own a junk yard, on the weekends to earn extra money. he likes to them push broken-down cars to the back of the junk yard because it makes him feel strong. last saturday, they pushed three cars with different weights, and he noticed he used different amounts of force for each one. the cars were the following weights: white car: 2,700 kg red car: 1,500 kg blue car: 2,100 kg think about how much force is needed to move each car. which correctly lists the cars in order from the most to least amount of force needed to move them? a) white, blue, red b) blue, red, white c) red, white, blue d) white, red, blue

Aphoton is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized. very far away from the nucleus, the released electron has a velocity of 750,000 m/s. what was the wavelength of the absorbed photon?