A typical automobile engine has an efficiency of 25%. Suppose that the engine of a 1000-kg automobile has a maximum power output of 140 hp. What is the maximum grade that the automobile can climb at 50 km/h if the frictional retarding force on it is 300 N?
Q: A champion athlete can produce one horsepower (746 W) for a short period of time. If a 70-kg athlete…
A: To go to the top of a 254 m highmountain, the athlete needs to gaina potential energy = mgh⇒P>E =…
Q: If a 1300 kg car can accelerate from 30 km/h to 60 km/h in 3.9 s , how long will it take to…
A:
Q: A student weighing 551 N climbs at constant speed to the top of an 14 m vertical rope in 17 s. What…
A:
Q: We want to slide a 10.0-kg crate up a 3.0-m-long ramp inclined at 30.0° A worker, ignoring friction,…
A: We need to calculate the speed of the crate once it comes back to the position it is thrown from.
Q: When its 80 kW engine is generating full power, a small single-engine airplane with mass 750 kg…
A: Given data: Full power of engine (Pfull) = 80 kW Mass (m) = 750 kg Speed (v) = 2.5 m/s Required:…
Q: of work. Assuming that you weigh 800 N, how high could the engine lift you?
A:
Q: Your gasoline engine has a limited supply of gasoline, able to do 5000 J of work. If you weigh 800…
A:
Q: A 96-kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 350…
A:
Q: A 1500 kg car and a 3000 kg car are lifted to the same height at a constant speed in a auto service…
A: Given- Mass m1 =1500 kg Mass m2 =3000 kg
Q: If the four Pratt & Whitney PW4000 turbofan engines of a Boeing 747-400 aircraft do 5620 Million…
A:
Q: A 618-kg elevator starts from rest and moves upward for 3.10 s with constant acceleration until it…
A: Given Data: The mass of an elevator is, m=618 kg The time required to move upward is, t=3.10 s The…
Q: A 700-kg elevator starts from rest. It moves upward for 3.50 s with constant acceleration until it…
A:
Q: By landing properly and on soft ground, humans have survived from airplanes when their parachute…
A: SOlution:
Q: When a 3600-lb automobile runs out of gas, it is pushed by its unhappy driver and a friend a quarter…
A: M = 3600 lb F =175 lb d = 0.250 mi = 1320 ft t = 15 min = 15 × 60 = 900 s
Q: A laundry uses an elevator to move items from one level to another. The elevator has a mass of 500…
A: Given : Mass of elevator (m) = 500 kg Time (t) = 3.00 s Cruising Speed (v) = 1.75 m/s 1 hp = 746 W
Q: A girl and her bicycle have a total mass of 60 kg. At the top of the hill her speed is 5.0 m/s. The…
A:
Q: A 1000 kg car is initially travelling at 26ms26ms along a horizontal road when the driver hits the…
A: The car is having a deceleration. The equation of motion is given by, v=u-at Here, v is the final…
Q: A motorist driving a 147-kg car on level ground accelerates from 20.0 m/s in a time of 5.00 s.…
A: The kinetic energy of the car is, KE=12mv2KE=12147 kg20.0 m/s2KE=29400 J
Q: A 650-kg elevator starts from rest and moves upward for 3.00 s with constant acceleration until it…
A:
Q: A truck accelerates uniformly from rest to 20 m/s in 8 s along a level stretch of road. Determine…
A:
Q: A 60.0 kg skier with an initial speed of 13.0 m/s coasts up a 2.50 m high rise as shown in the…
A:
Q: A 684-kg elevator starts from rest and moves upward for 4.20 s with constant acceleration until it…
A: Given: The mass of the elevator is m=684 kg, The cruising speed is vf=1.79 m/s. The time is t=4.20…
Q: A 694-kg elevator starts from rest and moves upward for 2.80 s with constant acceleration until it…
A: Data Given , Mass of the elevator ( m ) = 694 kg Elevator starts from rest , means Initial velocity…
Q: A sked is initially given a shove up a frictionless 23.0o incline. It reaches a maximum vertical…
A: Let v be the final velocity of the sked, u be the initial velocity of the sked, s be the length of…
Q: If a 1300 kg car can accelerate from 30 km/h to 60 km/h in 3.9 s , how long will it take to…
A: Mass of car, m = 1300 kg Velocities are, v1 = 30 km/h = 30*(1000m/3600s) => v1 = 8.33 m/s v2 =…
Q: When an automobile moves with constant speed down a highway, most of the power developeu Dy the the…
A: GIVEN:A car moving down a highway with a speed of 25m/s and has a 205 horsepower engine. 1hp=746W…
Q: A car of mass 920.0 kg accelerates away from an intersection on a horizontal road. When the car…
A: mass of car (m) = 920 kg speed (v) = 12.4 msNet power (P) = 5300 W
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- A 607-kg elevator starts from rest and moves upward for 3.90 s with constant acceleration until it reaches its cruising speed, 1.67 m/s. (a) What is the average power of the elevator motor during this period? hp(b) How does this amount of power compare with its power during an upward trip with constant speed? (Give the power during an upward trip with constant speed.)A 50 kg object has 1,800 J of potential energy when it is released and allowed to fall to the ground. At what speed will it hit the ground? Assume negligible frictional forces.A manufacturer uses an elevator to move items from one level to another. The elevator has a mass of 700 kg and moves upward with constant acceleration for 3.00 s until it reaches its cruising speed of 1.75 m/s. (Note: 1 hp = 746 W.) (a)What is the average power (in hp) of the elevator motor during this time interval? (b)What is the motor power (in hp) when the elevator moves at its cruising speed? (c)What If? If the elevator motor can only deliver constant power at one setting, the amount needed for its motion at constant speed, how long (in s) will it take the elevator to accelerate to the cruising speed of 1.75 m/s? (If you need to use or –, enter INFINITY or –INFINITY, respectively.)
- An airplane pilot fell to the ground after jumping from an aircraft without his parachute opening. He lands in a snowbank, creating a crater 2.1 m deep, but survived with only minor injuries. Assuming the pilot’s mass was 68 kg and his terminal velocity was 35 m/s (the velocity at the point he stopped accelerating on his way down), what is: a) the average force exerted on him by the snow in bringing him to rest? b) the work done by the snow?A 8kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 230N. For the first 13 m the floor is frictionless and for the next 14m, the coefficient of friction is 0.3. What is the final speed of the crate in m/s?A daredevil on a motorcycle leaves the end of a ramp with a speed of 39.6 m/s as in the figure below. If his speed is 37.1 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance.
- A 620-kg elevator starts from rest and moves upward for 4.50 s with constant acceleration until it reaches its cruising speed, 1.74 m/s. (a) What is the average power of the elevator motor during this period? (b) How does this amount of power compare with its power during an upward trip with constant speed? (Give the power during an upward trip with constant speed.)A 254 g textbook slides up a 20.3° incline that is 5.00 m long. Using conservation of energy and assuming the incline is frictionless, what minimum initial speed is needed to accomplish this?a girl and her bicycle have a total mass of 60kg. at the top of the hill her speed is 5.0m/s. The hill is 5.0 m high and 100 m long. If the force of friction as she rides down the hill is 20N, what is her speed at the bottom?
- I place a 10 kg box at the top of a ramp that is inclined at 25 degrees. It then slides 8 m down the incline. If the incline has a coefficient of kinetic friction of 0.3, what is the speed of the block after it has completed its 8 m slide?A 1300-kg elevator carries a maximum load of 750 kg. A constant frictional force of 3000 N retards its motion upward. What minimum power, (in horsepower), must the motor deliver to lift the fully loaded elevator at a constant speed of 3.50 m/s? 1 horsepower = 746 WFor exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at a constant speed in a time of 1.60 s. What is the metabolic power, in kW (kiloWatts)? Your answer needs to have 2 significant figure, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.