They look rough like my butt
You must look at the object either two or three times,
as follows:
1). Look at it the first time. Make a mental note, or take a photo,
of its location.
2). Wait a short time.
3). Look at the object the second time. Make another mental note,
or take another photo, of its position.
4). Compare the two photos or mental notes.
5). If the two images show the object in different places, then the object
is in motion RELATIVE TO YOU, and your investigation is finished. STOP.
6). If the two images show the object in the same identical place, then
you don't know the answer yet. It might be moving in a circle. You must
check it out.
7). Repeat step-1.
8). Repeat step-2, but wait a different length of time this time.
9). Repeat step-3. This gives you a third photo.
10). Compare the first and third photos.
. . . . . If these are still identical, you can be pretty sure that
the object is not in motion RELATIVE TO YOU.
. . . . . If these are different, then the object is in motion RELATIVE TO YOU.
For the given problem, we calculate the required time by
using the formula P = W/t.
P = [(1/2)mv_f^2 – (1/2)mv_i^2]/ t
The car accelerates from 0 -58 mph, so the power engine will
be
P = (1/2) x m x 58^2 / t = 1682 m / t
According to the problem, the engine produces full power so
the time required can be calculated as
420.5 m / 1.40 = 1682 m / t
t = 5.6 seconds
Answer:
(a) Ff = 3.95N
(b) Ff = 5N
Explanation:
(a) To find the friction force you use the second Newton law:
But you take into account the applied force and the opposite friction force:
you do Ff the subject of the formula and replace the values of the parameters:
(b) In the case of a motion with constant velocity you have that there is no acceleration. Hence:
Answer:
c. The truck with greater speed
Explanation:
Energy can be defined as the ability (capacity) to do work. The two (2) main types of energy are;
a. Gravitational potential energy (GPE): it is an energy possessed by an object or body due to its position above the earth.
b. Kinetic energy (KE): it is an energy possessed by an object or body due to its motion.
Mathematically, kinetic energy is given by the formula;
Where;
K.E represents kinetic energy measured in Joules.
M represents mass measured in kilograms.
V represents speed or velocity measured in metres per seconds square.
From the above formula, we can deduce that the kinetic energy of an object is directly proportional to the square of the value of its velocity or speed.
Hence, the truck with greater speed would have a greater amount of kinetic energy.