Forces
Is the normal force a reaction to the weight force via Newton’s 3rd Law?
(question 2)
No
Vector A has a magnitude of 10 and is completely directed in the +x direction. Vector B has a magnitude of 10 and is directed at 240 degrees counterclockwise from the +x axis. If vector R = B - A, what is the y component of vector R?
(question 3)
-8.66
An object is tossed straight upwards at 25 m/s from the top of a building which is 50 meters tall relative to the ground. How long does it take to reach its maximum vertical displacement?
(Question 5)
2.55s
A projectile is fired at 60 degrees above the horizontal at a speed of 25 m/s from the edge of a building which is 50 meters tall relative to the ground. What is the x component of the projectile's velocity just before it hits the ground?
(question 7)
12.50 m/s
A mass of 5kg is placed on a horizontal frictionless surface at rest. A force of 10N is applied vertically downwards, a second force of 10N +x direction, and a third force of 20N is applied in the -x directed. What is the normal force acting on the mass?
(question 1)
59.05N
Vector A has a magnitude of 10 and is completely directed in the +x direction. Vector B has a magnitude of 10 and is directed at 240 degrees counterclockwise from the +x axis. If vector R = B - A, what is the angle of vector R measured counter-clockwise from the +x axis?
(question 4)
210
An object is thrown straight upwards at 10 m/s from the edge of the roof of a building which is 50 meters above the ground. What is the velocity of the object when it comes back to the SAME HEIGHT it was launched from?
(question 18)
10 m/s in the -y direction
A projectile is fired at 60 degrees above the horizontal at a speed of 25 m/s from the edge of a building which is 50 meters tall relative to the ground. What is the maximum height of the projectile relative to the ground?
(question 9)
73.89m
A mass of 5 kg lies at rest on a horizontal, frictionless surface. A force of 20 N is applied to it in the +x direction and another force is applied to it at an angle of 30 degrees above the -x direction. What is the amount of the second force such that the mass never moves?
(question 11)
23.09N
Vector A has a magnitude of 10 and is directly completely in the +x direction. Vector B has a magnitude of 20 and is directed at 210 degrees from the +x axis.. If vector R = B - A, what is the y component of vector R?
(question 20)
-10
An object is tossed straight upwards at 25 m/s from the top of a building which is 50 meters tall relative to the ground. How long does it take the object to come back to the same height it was released?
(question 6)
5.10s
A projectile is fired at 60 degrees above the horizontal at a speed of 25 m/s from the edge of a building which is 50 meters tall relative to the ground. What is the maximum vertical displacement of the projectile?
(Question 8)
23.89m