![jbdelarosa](/avatars/25792.jpg)
jbdelarosa
12.11.2019 •
Physics
Calculate the power a car engine contributes to speeding the 1400 kg car up to a highway speed of 60.0 mi/h in 14.0 s.
Solved
Show answers
More tips
- L Leisure and Entertainment What to Give a Girl on March 8?...
- H Health and Medicine Heartburn: Causes and Ways to Get Rid of It...
- H Health and Medicine Simple and Effective: How to Get Rid of Cracked Heels...
- H Health and Medicine Relieving Swelling in Legs: Causes and Ways to Alleviate the Symptom...
- W Work and Career Мерчендайзинг – все, что нужно знать...
- O Other Everything You Need to Know About Kudyabliks...
- F Food and Cooking How to cook crayfish? Everything you need to know...
- F Food and Cooking Homemade kvass: recipe and brewing process...
- H Health and Medicine How to Choose the Right Tanning Cream?...
- S Style and Beauty Secrets of Tying a Pareo: 5 Ways...
Answers on questions: Physics
- P Physics You are to drive to an interview in another town, at a distance of 310 km on an expressway. The interview is at 11:15 a.m. You plan to drive at 100 km/h, so you leave at 8:00...
- P Physics A duck flying horizontally due north at 10.7 m/s passes over East Lansing, where the vertical component of the Earth s magnetic field is 4.09×10-5 T (pointing down, towards...
- P Physics A distant galaxy emits light that has a wavelength of 434.1 nm. On earth, the wavelength of this light is measured to be 438.6 nm. A) Decide whether this galaxy is approaching...
- P Physics A baton twirler in a marching band competition grabs one end of her 1.2 kg, 1.0 meter long baton. She throws her baton into the air such that it rises to a height of 5.0 meters...
- P Physics Come up with another myth about the classification of organisms. Then, give two to three reasons why the myth is untrue. Use complete sentences and support your answer with...
- P Physics A closed, rigid tank is filled with Refrigerant 134a. The tank initially contains 0.5 m3of saturated vaporand 0.1m3of saturated liquid, each at 30 °C. The tank is heated until...
- P Physics A horizontal spring on a frictionless surface has a spring constant of 8.5N/m with a mass of 1.5kg attached to the end of the spring. If the spring is stretched 2m past its...
- P Physics At LNG refinery site as part of a lubricating system for heavy machinery, oil of density 850kg/m^3 is pumped through a cylindrical pipe of diameter 7.0cm at a rate of 10.5...
- P Physics I. )Which unit can be used to express force? a. Nmb. kg/s 2c. kg • m/s 2d. m/sii. )Newton’s second law of motion relates an object’s acceleration toa. its mass.b. its velocity.c....
- P Physics A machine whose efficiency is 80% raised 2 tonnes of water through 22 m. Determine the work done...
Ответ:
35.6 kW
Explanation:
Given data
mass (m): 1400 kg
speed (v): 60.0 mi/h. In SI units,
time (t): 14.0 s
The acceleration (a) of the car is:
The force (F) exerted is:
F = m × a = 1400 kg × 1.91 m/s² = 2.67 × 10³ N
The distance (d) travelled is:
d = 1/2 × a × t² = 1/2 × 1.91 m/s² × (14.0 s)² = 187 m
The work (w) done is:
w = F × d = 2.67 × 10³ N × 187 m = 4.99 × 10⁵ J
The power (P) of the car engine is:
P = w / t = 4.99 × 10⁵ J / 14.0 s = 3.56 × 10⁴ W = 35.6 kW
Ответ:
The greatest speed of the car is 19.36m/s
Explanation:
The maximum speed the car will attain without skidding is given by:
F= uN = umg ...eq1
But F = mv^2/r
mv^2/r = umg
Dividing both sides by m, leaves you with:
V= Sqrt(ugr)
Where u = coefficient of static friction
g = acceleration due to gravity
r = raduis
Given:
U = 0.82
r=0.82
g= 9.8m/s
V = Sqrt(0.82 × 9.8 × 45)
V = Sqrt(374.85)
V = 19.36m/s