A force of 34.5 newtons is applied to an object at an angle of 45 º with the horizontal. What is the force acting on the object in the horizontal direction?

Answers

Answer 1
Answer: The horizontal component of the force is 34.5 cos(45) = 24.4 newtons

The vertical component of the force is 34.5 sin(45) = 24.4 newtons
Answer 2
Answer:

Answer:

24.4

Explanation:


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Which motion causes the apparent rising and setting of the moon each day as seen from a local location in Kansas

Answers


The apparent daily rising and setting of EVERY natural object
in the sky, as seen from virtually anywhere on Earth ... the sun,
every other star, the moon, every planet, comet, asteroid, galaxy,
etc. ... is the result of the daily rotation of the Earth itself.

Roughly every 24 hours, your eyes get turned in a complete circle. 
To keep watching any one thing in the sky, the direction you have
to look keeps turning.  In order to stare at the moon, you need to turn
your eyes, and eventually turn your head.  You don't feel the Earth
turning, so your brain decides that the Moon must be moving across
the sky.

The Earth's revolution in its orbit has nothing to do with the apparent
daily rising and setting of anything.


What is kirchoff s law???

Answers

There are two laws named for Kirchhoff.  The both concern electrical circuits.
Here they are in my own words:

1).  The sum of the voltage drops around any closed loop in a circuit is zero.

2).  The sum of the currents at any single point in a circuit is zero.
there are two
1 Kirchhoff's current law:
it states that the sum of all currents flowing in all conductors that meet at single point is zero..
2 Kirchhoff's voltage law:
it states that the algebraic sum of all voltages around any closed network is zero...

A 25-gram paper cup falls from rest off the edgeof a tabletop 0.90 meter above the floor. If the
cup has 0.20 joule of kinetic energy when it hits
the floor, what is the total amount of energy
converted into internal (thermal) energy during
the cup’s fall?
(1) 0.02 J (3) 2.2 J
(2) 0.22 J (4) 220 J

Answers

So a cup falls from the table top to the ground and acquires 0.20 J of kinetic energy in the moment it hits the ground and we want to know what is the total amount of energy converted into thermal energy. While it is on the table, the cup has potential energy and the kinetic energy is 0. The potential energy of the cup is Ep=m*g*h where m=mass of the cup, g= gravitational acceleration of 9.81m/s^2 and h=height of the table. So Ep=0.025*9.81*0.9=0.220725 J. That potential energy converts into kinetic energy and into thermal energy via friction that the air is causing. So Ep=Ek+Efriction. From here: Efriction=Ep-Ek=0.220725 J-0.20J=0.020725J So the correct answer is (1) 0.02J

A 0.15-kg ball is thrown into the air and rises to a height of 20.0 m. How much kinetic energy did the ball initially have?

Answers

IF the toss was straight upward, then the kinetic energy it got
from the toss is the gravitational potential energy it has at the top,
where it stops rising and starts falling.

Potential energy =  (mass)  x   (gravity) x (height)

                           = (0.15 kg) x (9.8 m/s²) x (20 m)

                           =      29.4 kg-m²/s²  =  29.4 joules .
The conservation of energy says that energy in an isolated system remains constant, that it is not created nor destroyed but transforms from one form of energy to another. 
So when the ball is thrown into the air, it has kinetic energy (KE). As it goes into the air, that kinetic energy transforms into gravitational potential energy (GPE). The higher it gets, the more GPE it has and therefore the less KE it has. 
At the top, all of it is transformed into GPE and there is no KE.
But total energy at any point after the ball is thrown until it lands it has the same energy throughout. 

Knowing this, you can set the beginning KE equal to the final GPE. 
KE = GPE

Insert formula for GPE.

KE = mgh
KE = 0.15kg*9.8m/s^2*20.0m
KE = 29 J

The ball initially had 29 J of kinetic energy

Two identical freight cars roll without friction (one at 1 m/s, the other at 2 m/s) toward each other on a level track. They collide, couple together, and roll away in the direction that _________.

Answers

Answer:

They collide, couple together, and roll away in the direction thatthe 2m/s car was rolling in.

Explanation:

We should start off with stating that the conservation of momentum is used here.

Momentum = mass * speed

Since, mass of both freight cars is the same, the speed determines which has more momentum.

Thus, the momentum of the 2 m/s freight car is twice that of the 1 m/s freight car.

The final speed is calculated as below:

mass * (velocity of first freight car) + mass * (velocity of second freight car) = (mass of both freight cars) * final velocity

(m * V1) + (m * V2) = (2m * V)

Let's substitute the velocities 1m/s for the first car, and - 2m/s for the second. (since the second is opposite in direction)

We get:

m*1 + m*(-2) = 2m*V

solving this we get:

V = - 0.5 m/s

Thus we can see that both cars will roll away in the direction that the 2 m/s car was going in. (because of the negative sign in the answer)

Quan sát sóng dừng trên sợi dây dài 60cm cố định hai đầu, thấy có 3 nút (bao gồm cả hai nút hai đầu) và 2 bụng. Bước sóng của sóng lan truyền trên sợi dây là:
A. 30cm. B. 40cm. C. 20cm. D. 60cm.

Answers

Answer:

Quan sát sóng dừng trên sợi dây dài 60cm cố định hai đầu, thấy có 3 nút (bao gồm cả hai

nút hai đầu) và 2 bụng. Bước sóng của sóng lan truyền trên sợi dây là: