PHYS 101 Lecture 1: p101tut1_2017-1

A car on a straight road starts from rest and accelerates 1.0 meters per second squared for 10 seconds. Then the car continues to travel at a constant speed for an additional 20 seconds.

A) Determine the speed of the car at the end of the first 10 seconds in meters per second.

B) On a grid, construct a graph of the car's speed as a function of time for the entire 30-second interval.

C) Calculate the distance the car travels in the first 10 seconds.

1. If an object moves with constant acceleration, its velocity a) must be constant also b) always decrease c) increases by the same amount each second  d)change by varying amount depending on its speed.

2. A man leans over the edge of a cliff and throws a rock upward at 4.9 m/s. Neglecting air resistance, two seconds later the rock's speed is a) 9.8 m/s  b) 14.7 m/s c) 4.98 m/s d) zero e) none of the above

3. Twelve seconds after starting from rest, an object falling freely will have a speed of a) 10 m/s b) 50 m/s c) more than 100 m/s d)100 m/s.

4. A ball is thrown 125 meters upward and then falls the same distance back to Earth. Neglecting air resistance, its total time in the air is about 10 seconds. about 15 seconds. about 5 seconds. more than 20 seconds. 

A thin flexible metal plate is attached at one end to aplatform, can be used to measure mass. when the free end of theplate is pulled down and released, it vibrates in simple harmonicmotion with a period that depends on the mass attached to theplate. to calibrate the force constant, objects of known mass areattached to the plate and he plate is vibrated, obtaining the databelow.

MASS AVERAGE TIME FOR 10VIBRATIONS PERIOD t(S) pERIOD(SQUARED) t (SQUARED)

0.1 5.05

0.2 7.22

0.3 9.03

0.4 10.1

0.5 10.95

0.7 13.25

0.9 15.30

1.2 17.33

1.5 19.06

Please plot a PERIOD VS. TIME and a T(squared) VS MASS graph

Using one of the graphs..an unknown mass is vibrated on theflexible plate and the time for 10 vibration is 24.4 seconds/determine the unkown mass from the graphs using reasoning.

Lastly, the relationship for SHM between period and mass is

T=2(pi)(SQUARE ROOT OF m/k) <---im sure you guys know thatequatiion.

Using this fact, determine the experimental value of the springconstant. Show your work please. And please show how you got theinformation from the graphs.

SORRY FOR LONG POST BUT IM TRULY LOST ON THIS ONE, I NEED YOURHELP FIGURING IT OUT. YOU GUS ARE THE GENIUSES , PLEASE HELP ME.ANY ATTEMPT OR SOLUTION WILL GET LIFESAVER. i only have a few hrsTHANK YOU!