A car traveling 60 km/h accelerates at the rate of 4.0 m/s2. How much time is required for the car to reach a speed of 90 km/h?
What will be an ideal response?
2.1 s
You might also like to view...
Determine the ratio of the total hemispherical emissivity to the normal emissivity for a nondiffuse surface if the intensity of emission varies as the cosine of the angle measured from the normal.
GIVEN
• A nondiffuse surface
• Intensity of emission varies as the cosine of the angle measured from normal
FIND
• The ratio of the total hemispherical emissivity (?) to the normal emissivity (?n)
SKETCH
One half second after starting from rest, a freely falling object will have a speed of about
A) 2 m/s. B) 5 m/s. C) 10 m/s. D) 20 m/s. E) none of the above
Approximately how long did the nucleosynthesis era last?
A) 10-10 seconds B) 5 years C) 5 minutes D) 0.001 seconds E) 5 seconds
The isotope, tritium, has a half-life of 12.3 years. Assume we have 10 kg of the substance. What will be the disintegration constant (in s?1)?
a. 5.6 × 10^?2 b. 5.6 × 10^8 c. 3.2 × 10^7 d. 1.8 × 10^?9 e. 1.6 × 10^6