A group of students design a model to explain how the different parts of a cell function. They choose a grocery store as a model for a cell. They place a map of a grocery store and a cell
diagram side by side to compare the parts of each.
Which part of a grocery store functions similarly to a cell membrane?
a
b
The brinks in the outer wall providing support for the roof
The aisles allowing customers to move between shelves of products
A sliding glass door opening and closing at the entrance
A time clock recording employee hours in the office
ос

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?