measurements / units / motion
number of significant figures in 3.0054
5
Newton's third law of motion is
for every action or force there is an equal but opposite reaction
what happens to mass and velocity when momentum changes?
mass remains the same and velocity changes.
the units for power, energy, and work are:
Watts and Joules
electrons will move from areas of ______ potential to areas of ______ potential.
high, low
number of significant figures in 2050000
3
newton's second of motion states that...
when an unbalanced force acts on an object, the object will accelerate on the same direction as the force.
what's the momentum of a 20kg object moving at 45m/s?
900 kg*m/s
a box was pushed with a force of 20N, producing 80J of work, how far did the box travel?
4 m
the greater the temperature, the _____ the resistance.
the thinner the wire, the _____ the resistance.
greater, greater
how long does it take for a car to go from 75 m/s to 50 m/s? [round to nearest tenth]
-2.5 s
a force of 22N is applied on an object with a mass of
15.3 kg, what's its acceleration? round to the nearest hundredth.
1.44 m/s^2
what is the impulse of a 19N force in 45s?
855N*s
a kid pulls a cart at an angle of 43 degrees with a force of 8 N, what is the horizontal force?
5.85 N
what is the charge of a current of 15A in a 15s interval.
60C
a woman on her bike increases her speed from 8.5 m/s to 15.5 m/s, how long did it take her to reach the 15.5 m/s? [round to the nearest tenth]
.71 s
what's the weight of an object with a mass of 76.8 kg? round to the nearest thousandth
753.408 N
the difference between elastic and inelastic collisions.
in an elastic collision, both momentum and KE are conserved, in an inelastic collision only momentum is conserved.
a rubber shoe is being pulled by a force of 30N, what kind of surface is the shoe being dragged on if it has a friction of 17.4N?
wet concrete
determine the electrostatic for of two protons .80 m apart.
3.60x10^-20
an airplane flying at 578 m/s flies 4000 m across the sky, what was its final velocity? [round to the nearest hundredth]
642.31 m/s
determine the gravitational force between the earth and an object with a mass of 17 kg on the Earth's surface.
167.12 N
cart A has a mass 10 kg and is traveling at a speed of 23 m/s across a frictionless horizontal surface when it collided with cart B. cart B has a mass 15 kg and was at rest when it collided with cart A. what is the velocity of the two carts after the collision?
9.2 m/s
a 123N box of marbles hangs from the ceiling at 20m above the ground. what's its KE?
2360J
a circuit has a potential difference of 5V in a time interval of 10s, making 10J of work. what's its resistance?
25 Ohms