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FREE FALL:
1. If a stone was initially thrown downwards at 4 m/s, how much time will it take to reach the ground? At what velocity will it hit the ground? At what time will it reach a velocity of 12m/s? Where is the stone at v=6 m/s?
2. Resolve practice problem number 1, if the stone was thrown upwards instead. Use the same given values. How high will the stone reach?
A ball is rolled on a flat surface with an initial velocity of 2 m/s. what is the ball's acceleration if it was found 15 meters away from its starting position after 5 seconds? What is the ball's velocity at a distance 20m? how long will the ball travel to achieve a velocity of 20 m/s?
A BODY AT REST IS TO BE ACCELERATED BY A CONSTANT
FORCE SO THAT IT WILL HAVE A VELOCITY OF 800 CM/S
AFTER EXACTLY 8 S. FIND THE FORCE IF THE BODY WEIGHS 490
DYNES.
Evaluate:
HORIZONTAL MOTION
1. The motion of a particle along the x -axis is described by the equation
m v = (3 s2) t + (0.5 m) t2 s2
where x is in meters, and t is in seconds. Determine the following:
a. Position of the particle 3 seconds after starting
b. Displacement from 2 sec to 5 sec c. Average velocity during first 5 seconds d. Velocity at t = 4secs
UARM:
e. Average acceleration during the second 3 seconds
f. Acceleration at t = 5 secs g. Time the particle moves at 20m/s
h. The acceleration and velocity at start of motion 1. A car is moving at uniform acceleration. Its velocity
A car is moving at uniform acceleration. Its velocity after traveling for 2 seconds is 4m/s
and is found 12 meters from where it started. If the car’s velocity at 5 seconds is 10 m/s,
determine (a) the car’s acceleration, (b) its displacement at t = 5 seconds measured
from its starting point and (c) its velocity at the start.
which physical phenomenon is used by both the electric motor and the generator?
Two projectiles are thrown with the same initial velocity, one at an angle and the other at
an angle of . (a) Can both projectiles strike the ground at the same distance from the
projection point? (b) Can both projectiles be in air for the same time interval?
An American ski jumper, has a mass of 59.6 kg. He is moving at a speed of 23.4 m/s at a height of 44.6 meters above the ground. Determine the total mechanical energy of the jumper.
a. 4.42 x 104 J
b. 4.24 x 10 -4 J
c. 4.24 x 10 3 J
d. 42. 24 x 104 J
Hannah with a mass of 56.2 kg) is traveling at a speed of 12.8 m/s at the top of a 19.5-m high roller coaster Loop in a THEME park.
Find the following:
A. Hannah’s kinetic energy at the top of the loop.
B. Hannah’s potential energy at the top of the loop.
C. Assuming negligible losses of energy due to friction and air resistance, determine Hannah’s total
mechanical energy at the bottom of the loop (h=0 m).
D. Determine Hannah’s speed at the bottom of the loop.
as we know bulb is producing light to fight darkness when is connected to electricity so is it possible to create a bulb that producing dark to fight lightness?
