Passengers in a high-flying jumbo jet feel their normal weight in flight, whereas passengers in an orbiting space vehicle do not because they are
A) beyond the main pull of Earth's gravity.
B) above the Earth's atmosphere.
C) without support forces.
D) all the above
E) none of the above
Answer: C
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During a positron emission tomography (PET) scan of the brain,
A) an external positron beam is sent through the patient's brain and detected as it leaves the patient. B) matter and antimatter annihilate within the brain to create positrons that are detected as they leave the patient. C) radioactive fluorine creates positrons within the brain that are detected as they leave the patient. D) positrons and electrons annihilate within the brain to create gamma photons that are detected as they leave the patient. E) highly sensitive detectors measure the positrons that are naturally emitted by the human body.
A curved mirror that produces an enlarged image will also have a greater field of view than a plane mirror
Indicate whether the statement is true or false
Estimate the heat loss per unit area from a blacktop highway at 110ºC if the air is still and 28ºC.
What will be an ideal response?
A proton moving along the x axis has an initial velocity of 4.0 × 10^6 m/s and a constant acceleration of 6.0 × 10^12 m/s2 . What is the velocity of the proton after it has traveled a distance of 80 cm?
a. 5.1 × 10^6 m/s b. 6.3 × 10^6 m/s c. 4.8 × 10^6 m/s d. 3.9 × 10^6 m/s e. 2.9 × 10^6 m/s