Consider each of the following statements that you might hear in everyday life. Classify each statement as either an observation or an explanation.
What will be an ideal response?
Answer:
Observations:
- James is wearing a yellow shirt
- The defendant's DNA was found at the crime scene
- The plastic melted when I held it near the light bulb
- The defendant's calendar says he was at lunch when the crime occurred
Explanations:
- James wears a yellow shirt when his other shirts are dirty
- Plastic melts when it reaches a temperature that breaks bonds that hold its structure intact
- The defendant only intended to scare the victim
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An 83 lbm cast iron bracket is hung from a wire and a spring weigh scale as shown. What would be the reading of the scale and what is the apparent density of the bracket. Assume the density of the iron is 535 lbm/ft^3 and the density of water is 62.4 lbm/ft^3.
The red coloration seen on the Martian surface originates from
A. when Mars' had flowing water, it also has red algae, which stained the surface rocks. B. the iron minerals in the surface rocks combining with oxygen in the atmosphere causing the surface to rust. C. the atmosphere blocking out blue light, only allowing red light to reflect off the surface. D. past volcanic activity covering the surface of the planet with red lava.
A supermassive black hole erupts when ____
a. it collides with a neutron star b. magnetic fields form tubes to channel the jets c. the accretion disk tilts to a new angle d. a sudden flood of matter flows inward producingan accretion disk e. starburst events irradiate the accretion disk with new energy
Coil 1, connected to a 100-? resistor, sits inside coil 2. Coil 1 is connected to a source of 60 cycle per second AC current. Which statement about coil 2 is correct?
A. No current will be induced in coil 2. B. DC current (current flow in only one direction) will be induced in coil 2. C. AC current (current flow in alternating directions) will be induced in coil 2. D. DC current will be induced in coil 2, but its direction will depend on the initial direction of flow of current in coil 1. E. Both AC and DC current will be induced in coil 2.