What do you mean by "actually" ? ? ?
Do you mean what time was it in New York when the earthquake began ?
OR
Do you mean what time was it at the place where the earthquake occurred
when the earthquake began ?
New York is in the Eastern Time Zone. That's five (5) zones west of UTC.
If the quake occurred between November and March, during the time
when the US is on Standard time or "Winter" time, then the first P-wave
was recorded in New York at 4:01 AM EST that morning.
If the quake occurred between April and October, during the time when
the US is on Daylight Saving time or "Summer" time, when clocks are set
1 hour ahead, then the first P-wave was recorded there at 5:01 AM EDT
that morning.
We have no way to calculate what the time was in the place where the earthquake occurred, because the question gives no information
regarding the location of its epicenter. We would need to know
not only its time zone, but also the actual distance from New York,
so that we could estimate the length of time it took for the P-wave
to reach the seismograph there.
Lol, I remember I helped my sister with this question but anyways, the card flew because of inertia and the quarter fell in the glass because of gravity :).
<span>They are balanced. If the forces were not balanced the book would move*. In this example, the downward force of gravity on the book is counterbalanced by the upthrust of the desk. </span>
1) Size of the image: 2 cm
In order to calculate the size of the image, we can use the following proportion:
where
p = 80 m is the distance of the tree from the pinhole
q = 20 cm = 0.2 m is the distance of the image from the pinhole
= 8 m is the heigth of the object
is the height of the image
By re-arranging the proportion, we find
2) Magnification: 0.0025
The magnification of a camera is given by the ratio between the size of the image and the size of the real object:
so, in this problem we have
Answer:
5.4 ms⁻¹
Explanation:
Here we have to use conservation of energy. Initially when the stick is held vertical, its center of mass is at some height above the ground, hence the stick has some gravitational potential energy. As the stick is allowed to fall, its rotates about one. gravitational potential energy of the stick gets converted into rotational kinetic energy.
= length of the meter stick = 1 m
= mass of the meter stick
= angular speed of the meter stick as it hits the floor
= speed of the other end of the stick
we know that, linear speed and angular speed are related as
= height of center of mass of meter stick above the floor = 
= Moment of inertia of the stick about one end
For a stick, momentof inertia about one end has the formula as
Using conservation of energy
Rotational kinetic energy of the stick = gravitational potential energy
