c. A2kg object moving East at a velocity of 21 meters per second strikes a 20 kilogram object that was at rest. After the collision the 2 kg object moves east with a velocity 1m/s and the 20 kg object moves east with a velocity of 2m/s What is the total momentum of the system before collision.^2 What is the total momentum of the system after the collision.
Which of the following surfaces can cause a loss of traction? Wet pavement Gravel roads Icy pavement All choices are correct
When you double the voltage in a simple electric circuit you double the Resistance Current Both of the above Neither of the above
Selecting from milligram gram, kilogram, and tonne determine the best unit of measure to express the weight of a pen? Choose the correct answer below. Grams Milligrams Kilograms Tonnes
9) What type of skid occurs when your front tires lose contact with the road surface? a) Spin-out b) Understeer c) Oversteer d) Four-wheel
How many significant figures are in the following number: 57,030 joules? 2 3 4 5
What condition or conditions are necessary for rotational equilibrium? A) sum Fx=0 B) sum Fx=0,sum T=0 C) sum T=0 D) sum Fx=0,sum Fy=0
Once food has been heated, hold it at 135^circ F or warmer. A. True B. False
Wind turbines are designed to carry out which type of energy transformation? A. Kinetic energy to sound energy, B. Gravitational Potential energy to electrical energy C. Electrical energy to light energy, D. Kinetic energy to electrical energy
A sound wave with an intensity of 25W/cm^2 is totally reflected. The intensity reflection coefficient is: 100% 50W/cm^2 25% 25W/cm^2
Atoms are electrically neutral when They have a minimal charge. They have a balanced number of protons and neutrons. They have a balanced number of protons and electrons. They have no valance electrons.
2. Suppose that hot coffee has a temperature of $90^{\circ }C$ in the coffee pot.You pour a serving of volume of 0.10 L into a ceramic coffee mug (specific heat $940J/kg^{\circ }C)$ that has a mass of 0.30 kg and is initially at $20^{\circ }C$ . What is the temperature of your coffee when the coffee and mug reach thermal equilibrium?
Ultraviolet (UV) radiation X-ray radiation, and some chemicals are all: a causes of mutations. b used in barbecuing. c treatments against radiation contamination. d none of these
What happens when an object vibrates in air? A. Light waves form B. Molecules bump into each other C. Energy disappears D. Space expands
16. A student calculates speed using the formula $speed=distance\div time$ Why is this formula useful? A. It tells how far an object can fall B. It shows how fast an object moves C. It explains why objects stop D. It measures acceleration
What is the wavelength of a 440 Hz sound traveling with a speed of $347m/s$ $Answer=$ $\square $
If Star A has three times the surface temperature of the Sun but has the same luminosity as the Sun, the radius of star A must be __ the radius of the Sun. $1/3$ 3 times $1/9$ 81 times
10. If you move a magnet in and out of a coil faster will the induced current be stronger or weaker? Explain.
16 of 28 Concepts completed Fill in the Blank Question A $\square $ scale can be used to exert a constant unbalanced force. e. It contains a $\square $ that stretches proportionally to the $\square $ of the applied force. C Need help? Review these concept resources. (1) Read About the Concept
the smallest unit of an element,the building block of matter Name the four Fundamental Forces from strongest to weakest subatomic particles Coulomb's Law atom
