Physics Answers

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

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?

Find the concentration of solution made by dissolving 2.50 g of sodium carbonate in 650 g of water?

What will be the final temperature if a 4 x 10⁷ J of heat is transferred to a 1 kg block of aluminum initially at 20°C