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A contractor agrees to build a dam 180ft long and 20ft high, 12ft wide at the bottom and 8ftwide at the top for $9.75 a cubic yard. Find his profit if his costs were $10000?
a concrete octagonal pier of height 10ft. is to resurfaced. if each of the base edges is 1ft. how many square ft. of surfacing will be required?
a 50 kg sled is pulled along a level surface at constant velocity by a constant force of 200n at an angle of 30° what is the coefficient of friction between the sled and the surface
A man cycles to his destination with the wind at 8 ms-1
and returns home against
the wind at 4 ms-1
. What is his average speed? (Hint: Let the distance between home
and work
Will a 250-N box on a floor move if a force of 25 N is applied on it? The coefficient of static friction between the box and the floor is 0.75.
O Yes
O No
O cannot be determined
O none of the above
How long will it take a 250-N box initially at rest reach a speed of 36 km/h when a force of 65 N is applied on it? The floor is frictionless.
O 1.2 S
O not among the choices
O 2.3 s
O 4.5 s
O 3.9 S
How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 MInutes.
A force of 486N stretches a spring by 0.08m. What is the force constant of the spring? What force will elongate the spring by 0.09m? What is the potential elastic energy when stretched by 0.18m?
A skydiver who's jumped from an airplane has reached a terminal speed of 40.8 m/s . How long will it take them to fall 478 meters? Round to one decimal places if needed.
A car pulls away from an intersection when the light turns green. After uniformly accelerating for the next 4.0 seconds, the car has travelled a distance of 25 m. The car then proceeds at constant speed.
a) what was the cars acceleration?
b) how fast was the car travelling when it finished accelerating?
c) how long will it take for the car to travel another 25 m at this constant speed?
#331389 on Nov 2022