1.) A car travels at 15 m/s for 10s. It then speeds up with a constant acceleration of 2.00 m/s^2 for 15s. At the end of this time, what is its velocity?
My answer: Vxf= 45 m/s
2.) An object is moving in a straight line with constant acceleration. Initially it is traveling at 16 m/s...
im having trouble setting my TI-83 Plus into "degree mode" so i can't seem to get the answers for these problems...im probably doing them wrong too
A material has an index of refraction of 1.75. What is the critical angle for this material?
Sin(critical angle)=1/n, n being the index of...
Hey,
I have a question to ask and was wondering if you guys could help me.
5.) A computer has a 300-W power supply. If household voltage is 120 V, how much current will flow through the computer?
A. 0.4 A
B. 2.5 A
C. 180 A
D. 420 A
E. 36,000 A
I picked B. I used the equation...
"In what way could angular momentum be changed?"
a) alter the mass
b)alter the angular velocity
c) redistribute the mass
d) all of the above
i picked all of the above because altering the mass and altering the velocity both change angular momentum..can you please explain this to me?
1) in what way could angular momentum be changed?
Ans) alter the mass, alter the angular velocity, and redistribute the mass
2) You have one screwdriver with a thick handle and one with a thin handle. Which one would be better for opening a stubborn can of paint?
Ans) Either...
hey...heres a question that's been bugging me
"The Earth and the moon attract each other with a gravitational force. How does the force acting on the more massive Earth compare to the force acting on the moon?"
Choices: a.) there is a greater force acting on the earth. b.)the same force is...
You have one screwdriver with a thick handle and one with a thin handle. Which one would be better for opening a stubborn can of paint?
my answer: either screwdriver--they are the same
Which screwdriver would be better for turning a stubborn screw?
my answer: the thick handled screw...
Ah i see..so it would be more stable if steel were on the bottom, because if steel were on top, it would require a smaller tilt to move hte center of gravity out of the support area
thank you very much,
mark
oh, ok. thank you edgardo.
One more question.
What power is required to accelerate a 500kg car from zero to 18 m/s in one minute?
First i found the kinetic energy
Ek=1/2mv^2
Ek=1/2(500kg)(18m/s)^2
Ek=250(324)=81000 J
Power= Joules per second
Power= 81000 J / 60
Power= 1350 W...
so if Work= Force Times Distance, then Work= (75N)(0.6m) which equals 45 Joules...where exactly does the 300N rock come ino the equation?
the problem I am facing is that 45 J is not one of the choices i have to choose from
oh and i really thank you guys for the tip/help..im going to look...
Hey again...im back with some more...these are simple questions that just boggle my mind..maybe I am just rushing myself.
What is linear motion?
My answer: Motion along a line
Question: A small coin is halfway between the center and the outer edge of a turntable rotating at 45 rpm. What...
greetings...i need some help please and someone to check if i did the problems correctly.
1.) How much kinetic energy will a 5kg ball have after rolling down a 1m high incline?
My Answer: 4.43 J
If Potential Energy=mgh, then P=(5kg)(9.81m/s^2)(1m) so...