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- Question
A tennis ball machine serves a ball vertically into the air from a height of 2 feet, with an initial speed of 110 feet per second. After how many seconds does the ball attain its maximum height?
Options- A. 2.87 sec
- B. 3.44 sec
- C. 4.65 sec
- D. 5.41 sec
- Correct Answer
- 3.44 sec
ExplanationIt is launched vertically with an initial speed of 110 ft/sec.
It will reach maximum height when the speed drops to 0.
Vo=110 feet per second
ho=2 feet
So, h(t) = -16t^2 +110t +2
Take the derivative: h'(t) = 110 -32t
The maximum height will be at the inflection when the derivative crosses the x-axis, then h'(t)=0.
So, set h'(t)=0 and solve for t:
0 = 110 -32t
-110 = -32t
t=3.4375
t=3.44 seconds.
- 1. Which must be true for metamorphism to occur?
Options- A. The grain size must become smaller
- B. The process must take place underwater
- C. The parent rock must be in solid form
- D. The parent rock must be igneous Discuss
- 2. Forces of attraction limit the motion of particles most in solids.
Options- A. TRUE
- B. FALSE Discuss
- 3. To resolve an object in an electron microscope,
Options- A. the wavelength of the electrons must be close to the diameter of the object
- B. the wavelength of the electrons must be greater than the diameter of the object.
- C. Both A & B
- D. None of the above Discuss
- 4. Electromagnetic waves are transverse in nature is evident by
Options- A. Reflection
- B. Polarisation
- C. interference
- D. Diffraction Discuss
- 5. Change in focal length of eye lens is caused by
Options- A. ciliary muscles
- B. iris
- C. pupil
- D. retina Discuss
- 6. In beta decay what is emitted
Options- A. electron
- B. proton
- C. neutron
- D. All of the above Discuss
- 7. A machine powered by rotating blades is a
Options- A. Fumerole
- B. Turbines
- C. Solar panel
- D. None of the above Discuss
- 8. Hot springs are heated geothermally by underlying
Options- A. water
- B. magma
- C. mitula
- D. None of the above Discuss
- 9. In human relations, the irritation threshold is the
Options- A. length of time an annoying behavior continues
- B. action that causes an annoyance
- C. frequency of the annoying behavior
- D. point at which a person notices something and becomes annoyed Discuss
- 10. Tensional forces normally cause which one of the following?
Options- A. normal faults
- B. strike-slip faults
- C. thrust faults
- D. reverse faults Discuss
Physics problems
Search Results
Correct Answer: The parent rock must be in solid form
Explanation:
Metamorphism is the method of changing the structure of a rock by using heat and temperature.
Hence, for this to happen the parent rock must be in solid form only. Therefore, option C) is true.
Correct Answer: TRUE
Explanation:
We know that, solids have definite shapes and definite volumes, whereas liquids have definite volumes but indefinite shapes and coming to gases it has indefinite volumes and indefinite shapes.
Hence, only in solids, the forces of attraction limit the motion of particles.
Correct Answer: the wavelength of the electrons must be close to the diameter of the object
Correct Answer: Polarisation
Correct Answer: ciliary muscles
Correct Answer: electron
Correct Answer: Turbines
Explanation:
Turbines are machines powered by rotating blades.
Correct Answer: magma
Explanation:
Magma is molten rocks beneath the earth's crust. Hot springs are heated geothermally by underlying magma.
Correct Answer: point at which a person notices something and becomes annoyed
Correct Answer: normal faults
Explanation:
Tensional forces normally cause normal faults.
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