Vectors
Motion
Newton laws of motion
Random
100
The vector A = 2 . 0 0 i + 3 . 0 0 j + 1 . 0 0 k.What is the magnitude of A?
sqrt of (14)
100
What is centripetal acceleration?
the acceleration in uniform circular motion is always directed toward the center of the circle, it is called centripetal acceleration.
100
what is newton first law of motion?
A body acted on by no net force has a constant velocity (which may be zero) and zero acceleration.
100
A gymnast with mass mG = 50.0 kg suspends herself from the lower end of a hanging rope of negligible mass. The upper end of the rope is attached to the gymnasium ceiling. What is the gymnast’s weight?
490N
200
What is the cross product of( i x i )or( j x j) or (k x k) equal to?
zero
200
What is the difference between distance and displacement?
Distance is a scalar quantity that refers to "how much ground an object has covered" during its motion.
Displacement is a vector quantity that refers to "how far out of place an object is"; it is the object's overall change in position.
200
What is 1 Newton equal to?
1N=1Kgm/s2
200
A 50.0-kg woman stands on a bathroom scale while riding in the elevator. What is the reading on the scale?
n=m(g+ay)
n=590N
300
What is a unit vector?
A unit vector is a vector that has a magnitude of 1, with no units.
300
what is the difference between speed and velocity?
Speed is a scalar quantity that refers to "how fast an object is moving."
Velocity is a vector quantity that refers to "the rate at which an object changes its position."
300
A worker applies a constant horizontal force with magnitude 20 N to a box with mass 40 kg resting on a level floor with negligible friction. What is the acceleration of the box?
Use F=ma
a=0.5m/s2
300
What are the SI units of power,work and energy?
watts,Joules,joules
400
What are the x and y components of vector DS? The magnitude of the vector is D=3.00m, and angle a = 45° with positive x-axis?
x=2.1m
y=2.1m
400
What are the three equations of motions with constant acceleration?
x=x0+voxt+1/2at2
v=v0x+axt
vx2=vo2+2ax(x-xo)
400
1Newton =?dynes
1 Newton = 105dynes
400
Each of the four jet engines on an Airbus A380 airliner develops a thrust (a forward force on the airliner) of 322,000 N. When the airplane is flying at 250 m/s, what horsepower does each engine develop?
1hp = 746W
P=Fv
P=108000hp
500
A cross-country skier skis 1.00 km north and then 2.00 km east on a horizontal snowfield. How far and in what direction is she from the starting point?
the far she goes =2.24km
the angle=63.4
500
Passengers on a carnival ride move at constant speed in a horizontal circle of radius 5.0 m, making a complete circle in 4.0 s. What is their acceleration?
arad=(4pi2R)/T2
arad=12m/s2
500
what is newton third law?
for every action there is an equal and opposite reaction.
500
draw a free body diagram for a object on an inclined plane when it is moving down the inclined plane.
Indicate all the forces on the object and decompose the forces.assume the inclined plane is frictionless.
