Fundamental frequency!
1. Ultrasound with a frequency of 4.079 MHz can be used to produce images of the human
body.If the speed of sound in the body is the same (1.97 km/s) as in salt water, what is the
wavelength in the body?
Answer in units of m.
and
2. On a day when the wind is...
1. A 600-N block is lifted by the friction-free pulley system shown.
a. How many strands of rope support the 600-N weight?
b. What is the tension in each strand?
c. What is the tension in the end help by the man?
d. If the man pulls his end down 60 cm, how many cm will the weight...
A big metal bead slides due to gravity along an upright frictiion-free wire. It starts from rest at the top of the wire as shown in the sketch. How fast is it traveling as it passes.
http://https://www.physicsforums.com/attachment.php?attachmentid=22509&stc=1&d=1260854052
Point B?
Point...
Momentum. I did all of them, can u check if i got them right!? thank you!
1. A moving car has momentum. If it moves twice as fast, its momentum is TWICE as much.
2. Two cars, one twice as heavy as the other, move down hill at the same speed. Compared to the lighter car, the momentum of the...
Basic Momentum and Energy! and time!
1. A 5.36 g bullet moving at 681.8 m/s penetrates a tree trunk to a depth of 3.79 cm.
a) Use work and energy considerations to find the magnitude of the force that stops the
bullet.Answer in units of N.
for this i did 1/2mv^2=w=fd
so...
Basic Momentum and Energy!
1. (part 1 of 2) A 4.78 g bullet moving at 510.8 m/s penetrates a tree trunk to a depth of 4.93 cm. a) Use work and energy considerations to find the magnitude of the force that stops the bullet.
Answer in units of N.
for this i did 1/2mv^2=w=fd
so...