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
What is the relationship between velocity and acceleration? Acceleration is the change in velocity over time. Velocity is the change in acceleration over time. Velocity and acceleration are equal and opposite. Velocity and acceleration have nothing to do with each other.
19. The process by which atomic nuclei spontaneously decay is called relative dating radioactivity erosion deposition 20. The time it takes for 50 percent of the nuclei in a radioactive sample to decay to its stable isotope is called the daughter product geologic time the half-life the half-time 21. The scientist who developed the theory of evolution was Harry Hess James Hutton Charles Darwin William Smith
Radloactive nuclel undergo decay because they are unstable. a TRUE b FALSE
Which of the following would cause a change in the speed of a sound wave? a the wave being made by a larger vibration b the wave moving through water C the wave changing medium from a gas to a liquid d the wave being made by a smaller vibration e none of the above
A man pulls a vacuum forward 13.6 m with a force of 33.9 N at a $55.0^{\circ }$ angle. How much work is being done to the vacuum by the man? $W=[?]J$
Select the cause of evaporation. Waves from the ocean Energy in the clouds Heat from the Sun Rain on the ground
True/False: The mass of the object affects the rate at which it falls. True False
If more force pushes two surfaces together, then the friction between the surfaces will __ stay the same increase decrease
Which of the following is the ideal way to apply pressure onto pedals? Gently at first and then with full force Stomping with force, so it reacts With your entire body weight behind it By pressing gradually
Select all of the types of electromagnetic waves that are ionizing radiation. gamma infrared microwave ultraviolet X-ray
