Kinetic Energy at 120 mph: Find Your Answer Here

AI Thread Summary
Kinetic energy at 120 mph can be calculated using the formula KE = (1/2)mv^2, where m is mass and v is velocity. The discussion highlights that the mass of the object is crucial for determining kinetic energy. A user mentions a train traveling at 200 km/h (120 mph) as a reference point. The conversation emphasizes the importance of specifying mass to avoid confusion. Understanding these principles can help clarify kinetic energy calculations.
samsam
Messages
9
Reaction score
0
Help i have brain ache, i need to know the kinetic energy at 120 mph ? please can someone help ?
 
Physics news on Phys.org
No, because you have not specified the mass. (Don't pass on the headache to us.:smile:)
 
Hi all i have to go on is a train doing Normal speed for the X2000 is 200 km/h (120 mph),
 
For a mass m moving at speed v, KE = (1/2)mv^2 (in consistent units.)
 
Thankyou so much mate. I might be home and dry for your help.
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
View full post »

Similar threads

Question about the Kinetic Energy of a baseball in flight
Replies
8
Views
3K
Combined Rotation and Translation of a Rectangular Plate
Replies
9
Views
2K
Conservation of Momentum Problem - Mechanical and Kinetic Energies
Replies
2
Views
958
Minimal rotational kinetic energy for a gyroscope to precess
Replies
33
Views
3K
Work done during a collision -- Change in Kinetic Energy & change in Momentum
Replies
1
Views
2K
Kinetic Energy of a Cylinder Rolling Without Slipping
Replies
21
Views
4K
Confused about a conservation of energy problem
Replies
4
Views
2K
Kinetic energy of the Monster Hunter cannon
Replies
3
Views
1K
Resistance force changing the velocity of an object
Replies
8
Views
1K
Why is the Kinetic Energy of a Spring (1/6)mv²?
Replies
13
Views
2K

Hot Threads

Recent Insights

Back
Top