![zaniathomasel](/avatars/25056.jpg)
zaniathomasel
18.01.2021 •
Physics
Two blocks of masses M and 3 M are placed on a horizontal, frictionless surface. A light spring is attached to one of them, and the blocks are pushed together with the spring between them. A cord initially holding the blocks together is burned; after this, the block of mass 3M moves to the right with a speed of 2.00 m/s.
a. What is the speed of the block of mass M?
b. Find the original elastic energy in the spring if M = 0.30 kg.
Solved
Show answers
More tips
- C Computers and Internet Which Phone is Best for Internet Surfing?...
- F Food and Cooking Everything You Need to Know About Pasta...
- C Computers and Internet How to Choose a Monitor?...
- S Style and Beauty How to Get Rid of Peeling Nails: Natural Remedies...
- S Science and Technology Understanding Magnetic Storms: A Guide to This Natural Phenomenon...
- F Family and Home What is Most Important in Men s Lives?...
- G Goods and services Which TV is better - LCD or Plasma?...
- C Computers and Internet Are there special gaming mice?...
- G Goods and services LED-подсветка в LCD-телевизорах: 5 причин, почему она лучше других технологий...
- C Computers and Internet Keep Your Mouse Pad Clean: The Right Way to Clean It?...
Answers on questions: Physics
- P Physics If we know the force, the distance, and the time we can calculate a. only power. b. work and power. c. only work. d. neither work or power....
- P Physics Less work was done. what is one possible reason why this has happened? a. there was more force applied; therefore, there was less movement. b. there was less force applied;...
- P Physics What is the force on a .8 kg peach falling freely in a Yakima orchard...
- P Physics What are the bending spring constants for a silicon cantilever with E = 170 GPa, h = 5 µm, w = 2 µm, and L = 100 µm? In real manufacturing, there is likely a dimensional...
- P Physics A block of mass 200 grams is connected to a light, horizontal spring with a spring constant k= 5 N/m. It is free to oscillate on a frictionless surface, and we’ll also...
- P Physics Ozone Multiple Choice is formed mainly in the troposphere where it diffuses to the stratosphere. is only destroyed through natural processes. is only formed through...
- P Physics Why do objects in orbit appear to be weightless?...
- P Physics The purpose of the control group is to...
- P Physics What happens when you disconnect an electromagnet from battery? A.it wil explode B.it will continue to attract non-metals C.it will stop from attracting metals E.nothing...
- M Mathematics A right rectangular prism s edge lengths are 4.1 inches, 4 inches, and 3 inches. How many unit cubes with edge lengths of inch can fit inside the prism? A) 945 unit...
Ответ:
-6 m/s
7.2 J
Explanation:
Given that
Initial velocity, u of both bodies = 0
Initial momentum = 0
Final velocity, v of the 3M block = 2 m/s
Mass M of the block A = M
Mass M' of the block B = 3M
Using the law of conservation of momentum, we know that
M * V(a) + 3M * V(b) = 0
Remember that the velocity of the block 3M block is V(b) = 2 m/s, so then
M.V(a) = - 3M * 2
V(a) = -6M/M
V(a) = -6 m/s
b
If mass M = 0.3 kg, then
K.E = 1/2 * M * V(a)² + 1/2 * M' * V(b)²
If we substitute values, we have
K.E = 1/2 * 0.3 * (-6)² + 1/2 * (3 * 0.3) * 2²
K.E = 0.15 * 36 + 2 * 0.9
K.E = 5.4 + 1.8
K.E = 7.2 J
Ответ:
I = 0.25 [amp]
Explanation:
To solve this problem we must use ohm's law which tells us that the voltage is equal to the product of the current by the resistance.
V = I*R
where:
V = voltage [Volt]
I = amperage or current [amp]
R = resistance [ohm]
Since all resistors are connected in series, the total resistance will be equal to the arithmetic sum of all resistors.
Rt = 2 + 8 + 14
Rt = 24 [ohm]
Now clearing I for amperage
I = V/Rt
I = 6/24
I = 0.25 [amp]