IdeasCuriosas - Every Question Deserves an Answer Logo

Questions in physics

[Answered] An egg is dropped from a height of 90 ft. If acceleration due to gravity is [tex]$-16 ft / s ^2$[/tex] and initial velocity is [tex]$0 ft / s$[/tex], approximately how long will it take for the egg to reach the ground? [tex]$h(t)=a t^2+v t+h_0$[/tex] A. 1.9 s B. 2.4 s C. 9.7 s D. 40.7 s

[Answered] Which statement is best supported by the table? | Wave | Observations | |---|---| | W | Its motion is perpendicular to wave motion. | | X | Its particles move up and down. | | Y | Its particles only move small amounts. | | Z | Its motion is parallel to wave motion. | A. Waves W and Y are transverse waves, Wave X could be a longitudinal or transverse wave, and Wave $Z$ is a longitudinal wave. B. Waves W and Y are longitudinal waves, Wave X could be a longitudinal or transverse wave, and Wave $Z$ is a transverse wave. C. Waves W and X are longitudinal waves, Wave Y could be a longitudinal or transverse wave, and Wave $Z$ is a transverse wave. D. Waves W and X are transverse waves, Wave Y could be a longitudinal or transverse wave, and Wave $Z$ is a longitudinal wave.

[Answered] What is an astronomical unit (AU)? A. the diameter of the Sun B. the radius of the Sun C. the average distance between Earth and its moon D. the average distance between Earth and the Sun

[Answered] A helicopter's speed increases from $30 m/s$ to $40 m/s$ in 5 seconds. What is the acceleration of this helicopter?

[Answered] $L =$ loudness, in decibels $( dB ) ; I =$ sound intensity, in watts $/ m ^2 ; I_0=10^{-12}$ watts $/ m ^2$ The loudness of a jack hammer is 96 dB . Its sound intensity is about $\square$ 0.004 The loudness of a compactor is 94 dB . Its sound intensity is about

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] An electric motor converts electrical energy into which kind of energy? A. potential B. kinetic C. stored D. chemical

[Answered] What is the approximate tangential speed of an object orbiting Earth with a radius of $1.8 \times 10^8 m$ and a period of 2.2 $\times 10^4$ s? A. $7.7 \times 10^{-4} m / s$ B. $5.1 \times 10^4 m / s$ C. $7.7 \times 10^4 m / s$ D. $5.1 \times 10^5 m / s

[Answered] A. How many degrees Fahrenheit are between the temperature of freezing water and the temperature of boiling water? B. How many degrees centigrade are between the temperature of freezing water and the temperature of boiling water? C. Comparing these 2 numbers, how many °F is 1 °C? (Answer as a round whole number). D. If the temperature at the center of the Earth is about 6000 °C, what is this approximate temperature in °F?

[Answered] 2. State and explain Ohm's law. 3. How does the resistance of a conductor vary with its (i) length and (ii) area of cross section? 4. Mention the expression for resistance in terms of resistivity and explain the terms. 5. Define electrical resistivity of a conductor. Mention its SI unit. 6. Mention any two factors on which resistivity of a metal depend. 7. Write any two differences between resistance and resistivity. 8. Define electrical conductivity of a conductor. Mention its SI unit. 9. Define current density in a conductor. Mention its SI unit.