What is the difference between a vector and scalar quantity? GIve example of scalars(4) and vectors(2).
A vector has magnitude and direction and scalars do not.
Scalars-distance,speed,mass,time
Vectors-displacement,velocity
100
An object travels a distance of 5 km towards east, then 4 km towards north and finally 10 km towards east
1) what is total traveled distance?
2) what is resultant displacement?
1)19 km
2)15.5 km
100
What are Newtons 1st,2nd,and 3rd law?
Law of inertia, F=ma,Action-Reaction
100
What is the average speed of an object which
travels 63m in 3.4s?
19 m/s
200
A moving object X has a mass m and speed v. Another moving object Y will have twice the momentum of X if it has a mass and velocity of:
mass= 4 m velocity= 1/2 v
200
A baseball is thrown straight up into the air and has a hang-time of 6.25 s. Determine the height to which the ball rises before it reaches its peak
d = 47.9 m
200
A body covers 1/4 journey with a speed of 40 km/h, 1/2 of it with 50 km/h and remaining with the speed of 60 km/h. Calculate average speed for entire journey.
speed=32.4 km/hr
200
A box is pulled with 20N force. The mass of the box is 2kg and the surface is frictionless. Find the acceleration of the box.
a=8m/s
200
In a displacement-time graph, the slope equals the
object’s _____________________.
1-20
In a velocity-time graph, the slope equals the object’s
________________________.
1)velocity
2)acceleration
300
There are ____ in 0.05 ml?
-0.00005 liters
-5 liters
-50 liters
-0.0005 liters
0.00005 liters
300
A bullet is shot form a rifle with a speed of 720.0 m/s.
a)What time is required for the bullet to strike a target 3240.0 m to the east?
b)What is the velocity of the bullet in km/h?
a) 4.5s
b)2,592 km/h
300
If a person throws a ball horizontally at 25m/s from a cliff with a height of 45 meters how far form the base does the ball hit the ground?
75 meters
300
A net force of 25 Newtons is applied horizontally to a 10 kg block resting on a table. What is the magnitude of the acceleration of the block?
2.5m/s^2
300
If someone standing on a frictionless surface throws
a 6.2 kg ball at 7.8 m/s, with what speed will that
person go backwards?
0.47 m/s
400
Express in scientific notation:[27.3 x 10-22][2.0 x 1018]=
2.73
400
If Michael Jordan has a vertical leap of 1.29 m, then what is his takeoff speed and his hang time (total time to move upwards to the peak and then return to the ground)?
vi = 5.03 m/s
t = 1.03 s
400
With what speed in miles/hr (1 m/s = 2.23 mi/hr) must an object be thrown to reach a height of 91.5 m (equivalent to one football field)? Assume negligible air resistance.
vi = 94.4 mi/hr
400
The magnitude of the force that a baseball bat exerts on a ball is 50 newtons. What's the magnitude of the force that the ball exerts on the bat? Why?
50 newtons/
Every reaction has an equal and opposite reaction.
400
If a box is sitting on a ramp and not sliding down, the
frictional force must be equal to the
__________________ force.
parallel
500
convert 4.978 Mg to dg
4.978 x 107 dg
500
A plane has a takeoff speed of 88.3 m/s and requires 1365 m to reach that speed. Determine the acceleration of the plane and the time required to reach this speed.
a = 2.86 m/s/s
t = 30. 8 s
500
A baby and a stroller have a total mass of 20 kg.A force of 36 newtons keeps the stroller moving in a circular path with a radius of 5 meters. Calculate the speed at which the stroller moves around the curve.
v=3m/s
500
A moving object X has a mass m and speed v. Another moving object Y will have twice the momentum of X if it has a mass and velocity of:
mass=4 m velocity= 1/2 v
500
If a 67 kg person weighs 300 N on a different planet,
what is the gravitational acceleration on that planet?