Lightning is the result of a build-up of electric charge difference caused by: (a). Violent collision of raindrops. (b). Rapid coalescence of cloud droplets. (c). Riming due to sudden temperature changes. (d). Freezing of supercooled liquid water droplets. (e). Collision of graupe and ice crystals
What is the final temperature of a system with a volume of 88.70mL with an initial temperature of 56.00 Celsius and the volume increases to 899.0mL? 242.4K 32.46K 3335K 57.98K
Multiple Choice 2 points If an air parcel is completely at rest, which of the following forces can make the parcel begin to move? (a) friction (b) centripetal (c) pressure gradient (d) gravity (e) Coriolis
Which of the following is not part of the nucleus of an atom? Electron Noutron Proton
Can the Doppler effect be observed with longitudinal waves or with transverse waves? Longitudinal only Neither Both Transverse only
The pressure in a tire is observed to rise after a car has been driven 5 miles. This is an example of __ Law. Charles' Boyle's
What is torque? The advantage gained by using a mechanism to transmit force A gear that is connected to motor or other input force A robot that gets mobility from wheels, tank treads or another method The measure of a force causing
The piezoelectric crystal of a transducer typically has an impedance higher than the impedance of skin. True False
If a person is struck by lightning, you should not touch them because they carry an electrical charge. True False
A PERSON CAN CARRY ITEMS WHILE ASCENDING AND DESCENDING A MOBILE LADDER? True False
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
