Measurments / Units/ Motion
What digits in measurment are valid ?
Significant Figures
Which object has the most inerita
What is the speed of a 1.0 x 10^3-kilogram car that has a momentum of 2.0 x 10^4 kilogram meters per second east ?
2.0 x 10^1 m/s
one watt is equivalent to one
J/s
A positvely charge glass rod attracts object X. The net charge of object X
must be negative
25.805-9.15
16.66
A force of 1 newton is equivalent to 1
2. kg.m/s
Which situation will produce the greatest change of momentum for a 1.0 kilogram cart.
applying a net force of 5.0 N for 2.0 s
The work done in lifting an apple one meter near Earths surface is approximately ?
1. 1J
The charge-to mass ratio of an electron is
1.76 x 10^11 C/kg
4.521/2.32
1.95
Sand is often placed on an icy road because the sand
increases the coffiecent of friction between the tires of a car and the road
Which term identifies a scalar quantity ?
time
As a ball falls freely toward the ground, its total mechanical energy
remains the same
What is the charge of a proton
1.60 x 10^-19 C
Determine the order of magnitude
19.81 m/s^2
10^1 m/s^2
A 25.0-kilogram space probe fell freely with an acceleration of 2.00 meters per second just before it landed on a distant planet. What is the weight of the space probe on that planet?
50.0N
which two quantities can be expressed using the same units ?
impulse and momentum
A 5- newton force causes a spring to strech 0.2 meter. What is the potential energy stored in the stretched spring ?
0.5 J
What is the current through a wire if 240 coulombs of charge pass through the wire in 2.0 minutes ?
2.0 A
convert 64.1cm
641
A ball is thrown straight upward from the surface of Earth. Which statement best describes the balls velocity and acceleration at the top of its flight.
Velocity is zero and acceleration is nonzero.
At the circus, a 100-kilogram clown is fired 15 meters per second from a 500-kilogram cannon. What is the recoil speed of the cannon ?
3.0 m/s
A spring with a spring constant of 80 newtons per meter is displaced 0.30 meter from its equalibrium position. The potential energy stored in the spring is ?
3.6 J
Which changes would cause the greatest increase in the rate of flow of charge through a conducting wire.
increasing the applied potential difference and decreasing the length of wire.