Projectile motion really confused please reply soon

AI Thread Summary
A baseball player hits a home run, launching the ball at a 30.0-degree angle with a velocity of 40.0 m/s. The problem requires calculating the horizontal distance the ball travels while in the air, which is 141 meters. The user initially struggles to determine the time of flight and receives varying answers. Ultimately, the user finds the correct solution before the test. The discussion highlights the challenges of solving projectile motion problems in physics.
DJ-Smiles
Messages
46
Reaction score
0

Homework Statement



A baseball player leads off the game and hits a long home run. The ball leaves the bat at an angle of 30.0o from the horizontal with a velocity of 40.0 m/s. How far will it travel in the air? [141 m]

Homework Equations



Equations of motion

The Attempt at a Solution



I have tried to figure out the time it takes and i just have no clue every answer i get is different and wrong to the answer please tell me my test is tomorrow and am in dier need of help
 
Physics news on Phys.org
nevermind I have found the answer
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
Back
Top