Forces
Which of Newton's third law most relates to inertia?
The first Law
What two variable does momentum depend on?
mass and velocity
What are the two formulas for work?
W= Fd
and
energy final - energy initial
What is the formula for finding voltage?
V=IR
What is the formula for finding heat energy?
Q = m•C•ΔT
What is the acceleration of a 50 kg object pushed with a force of 500 newtons?
10 m/s2
A 1300 kg race car is traveling at 80 m/s while a 15,000 kg truck is traveling at 20 m/s. Which has the greater momentum?
Car: 104 000 kg*m/s,; truck: 300 000 kg*m/s
Truck!!
What are the two formulas for impulse?
Δp=𝑚Δ𝑣
Δp=FΔt
What is the voltage if a resistance of 25 Ω produces a current of 250 amperes?
V = I x R
V = (250) (25)
V=6250 Volts
100.0 g of 4.0°C water is heated until its temperature is 37°C.
What is the change in temperature
33°C
An object of mass 30 kg is in free fall in a vacuum where there is no air resistance. Determine the acceleration of the object.
Since it is in free fall and is falling due to the force of gravity.....the acceleration will always be 10 m/s2
A model jet rocket applies an impulse of 20 N*s over 3s interval of time. What is the force applied?
20/3= 6.667 N
A baby carriage that is carrying twins is sitting at the top of a knoll that is 21 m high. The carriage with the babies are 48kg. What is the Potential Energy of the twins and the carriage?
10080J
Two positively charged point charges have a force of 5N between them.
If both charges are tripled, what is the new net force?
Are the forces attractive or repulsive? Explain.
30 N, repulsive because same charges repel each other
120.0 g of water from 2.0 °C to 24.0 °C? The specific heat of water is 4.18 J/g°C.
What is the change in temperature?
How much energy was required to heat the water?
a. 22°C
b. Q = 11035J
An object of mass 30 kg is falling in air and experiences a force due to air resistance of 50 newtons.
f=ma f=30 x 10 f=300N Net force is 300-50 = 250N
calculate the acceleration of the object.
F= ma 250N=30 (a) a=8.33 m/s2
The parking brake on a 1200kg automobile has broken, and the vehicle has reached a momentum of 7800kg.m/s. What is the velocity of the vehicle?
V = p/m = 7800/1200 = 6.5m/s
An object has a kinetic energy of 25 J and a mass of 34 kg , how fast is the object moving?
1.28m/s
One positive and one negative point charge have a force of 15 N between them.
If the distance is tripled, what is the new force?
Is the force attractive or repulsive? Explain.
5 N, attractive because opposite charges attract each other
A 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°C to 175°C.
What is the change in temperature?
Calculate the specific heat capacity of iron.
a. 150°C
b. c = 0.46 J/(g°C)