SUBJECT: PHYSICS 1. A lawn-mower is pushed with a force of 50N. If the angle between the handle of the mover and the ground is 30° i. Calculate the magnitude of the force that is pressing the lawn-mower directly into the ground.
ii. Calculate the magnitude of the effective force that moves the mower forward
iii. Why does the lawn-mower move forward and not downward into the ground?​

Which of the following harmful chemicals are found in tobacco smoke? a. carbon monoxide b. carbon dioxide c. nicotine b. carbon dioxide d. both a and c

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?