Basic Kinematics HW questions for AP Physics

AI Thread Summary
A soccer player kicks a ball at a 42-degree angle with an initial velocity of 18 m/s, and the receiver is 46 meters away. To solve the problem, it's necessary to determine the maximum height and the time the ball is in the air. Relevant kinematic equations should be listed and utilized, along with a diagram to clarify the horizontal and vertical components of the motion. The discussion emphasizes the importance of breaking down the problem into manageable parts to find the receiver's required speed before the ball hits the ground. Understanding these concepts is crucial for solving similar kinematics problems in physics.
cntower
Messages
1
Reaction score
0

Homework Statement


A soccer player kicks a ball at an angle of 42 degrees to the horizontal. The ball leaves his foot with a velocity of 18m/s. The player that receives this ball is standing 46m from the kicker. How fast does the reciever need to receive the ball befor eit hit's the ground?

Homework Equations





The Attempt at a Solution


Well. I tried by first figuring out the Max height the ball will be at...then I am lost.
 
Physics news on Phys.org
cntower said:

Homework Statement


A soccer player kicks a ball at an angle of 42 degrees to the horizontal. The ball leaves his foot with a velocity of 18m/s. The player that receives this ball is standing 46m from the kicker. How fast does the reciever need to receive the ball befor eit hit's the ground?

Homework Equations





The Attempt at a Solution


Well. I tried by first figuring out the Max height the ball will be at...then I am lost.

Welcome to the PF. List the relevant kinematic equations that you should use. Draw a diagram and use that to help you figure out the horizontal and initial vertical velocities...
 
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