A lorry has a mass of 10 tonnes (one tonne equals 1000kg) and a surface area of 6.3m2. Its aerodynamic drag coecient is measured to be 0.530. Assume the drag force is proportional to v2, given by F = 1/2DρAv2 and ignore other sources of resistive force. d) Find the power required to maintain a speed of 60 km/h on an incline of 10%.

A lorry has a mass of 10 tonnes (one tonne equals 1000kg) and a surface area of 6.3m2. Its aerodynamic drag coecient is measured to be 0.530. Assume the drag force is proportional to v2, given by F = 1/2DρAv2 and ignore other sources of resistive force. d) Find the power required to maintain a speed of 60 km/h on an incline of 10%.

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter7: Conservation Of Energy

Section: Chapter Questions

Problem 67P: Review. The mass of a car is 1 500 kg. The shape of the cars body is such that its aerodynamic drag...

See similar textbooks

Similar questions

Suppose you use an ideal pulley of the type shown in Figure 5.18(a) to support a car engine of mass 100 kg. Figure 5.18 (a) What would the tension in the rope be?N(b) What force must the ceiling supply, assuming you pull straight down on the rope? Neglect the pulley system's mass.N (upward)
Suppose a 20,000 kg jet lands on the surface of an aircraft carrier. As it lands, it engages a tailhook wire, a wire which behaves as if it were connected to a spring with a spring constant of Ks = 25,000 J/m2. This slows the jet down to rest within 60 m. What was the jet's landing speed? (Actual tail hooks use hydraulics instead of a spring to absorb the just energy, but let's pretend).
The ultralight plane Gossamer Condor in 1977 was the fi rstto complete the Kremer Prize fi gure-eight course under humanpower. Its wingspan was 29 m, with Cav = 2.3 m and atotal mass of 95 kg. The drag coeffi cient was approximately0.05. The pilot was able to deliver 1/4hp to propel the plane.Assuming two-dimensional fl ow at sea level, estimate(a) the cruise speed attained, (b) the lift coeffi cient, and(c) the horsepower required to achieve a speed of 15 kn.
A 12 kg box is released from the top of an incline that is 5 m long and makes an angle of 40 degrees to the horizontal. The friction force between the box and the incline is 60 N. What is the coecient of kinetic friction µk between the box and the incline?
Suppose you use an ideal pulley of the type shown in Figure 5.18(c) to support a car engine of mass 125 kg. (a) What would the tension in the rope be? Answer in N(b) What force must the ceiling supply, assuming you pull straight up on the rope? The pulley system's mass is 6.00 kg.Answer in N (upward)
A small aircraft has a wing area of 35 m2, a lift coefficient of 0.45 at takeoff settings, and a total mass of 4000 kg. Determine (a) the takeoff speed of this aircraft at sea level at standard atmospheric conditions, (b) the wing loading, and (c) the required power to maintain a constant cruising speed of 300 km/h for a cruising drag coefficient of 0.035.
In a city in England with a temperature of 18 ° C, it is desired to install a wind farm with 10 wind turbines 80m high and aerodynamic coefficient equal to 0.3. For this, a study of wind measurement through an anemometer installed at 15 m height indicating speed 5 m / s in a place with high grass. Size the turbine blades in this wind farm so that obtain a mechanical power of 500 kW that will supply the entire community, calculating the wind speed, considering the roughness factor in the tall grass equal to 0.18. (Image 1 - Formula to wind speed)
a block slides from rest from the top of an inclined plane 8m long which is inclined 35 degrees with the horizontal .if the coefficient of kinetic friction is 0.20 ,determine how long it will take the block to reach the bottom of the plane
A 2 kg box is put on the surface of an inclined plane at 27 degrees with the horizontal. The kinetic coefficient of friction is μ = 0.3. If released from rest at a height of 3 meters, how long would it take the box to reach the bottom?
Suppose you use an ideal pulley of the type shown in Figure 5.18(c) to support a car engine of mass 135 kg. Figure 5.18 (a) What would the tension in the rope be? N (b) What force must the ceiling supply, assuming you pull straight up on the rope? The pulley system's mass is 9.00 kg. N
An airplane has a mass of 50,000 kg, a wing area of 300 m2, a maximum lift coefficient of 3.2, and a cruising drag coefficient of 0.03 at an altitude of 12,000 m. Determine (a) the takeoff speed at sea level, assuming it is 20 percent over the stall speed, and (b) the thrust that the engines must deliver for a cruising speed of 700 km/h.
A 1,801-kg car starts from rest at the top of a driveway 6.14 m long that is sloped at an angle of 31 degrees with the horizontal. If an average friction force of 3,386 N impedes the motion of the car, find the speed (in m/s) of the car at the bottom of the driveway.