Themes, topics - practice problems - page 2 of 110
Number of problems found: 2198
- Increases 69454
The car weighs 1850 kg and increases its speed from 27 to 81 km / h. How much has its kinetic energy increased?
- Power during takeoff
The aircraft weighing 3.5 tons will disembark 1 km in 1 minute after takeoff and reach a speed of 290 km/h. Find the average power of its engines during this time.
- Kilometers 69264
Laura went for a new bike ride. In an hour, her father followed her on the same route at a speed of 60 km / h and overtook her in 1/2 hour. a) Find in kilometers the length of Laura's route before her father caught up with her. b) Determine in kilometers
- Determine 69154
Determine the pump power if: I pour 3 m³ of water from the tank in 120 seconds with a hose. The height of the hose mouth above the tank is 1.5 m. The speed of the water from the mouth of the hose is 20 m / s.
- Increasing 69094
The aircraft weighing 61 t climbed from a height of 1000 m to a height of 3000 m while increasing the speed from 170 m / s to 210 m / s. What work did the aircraft engines do?
- A train
A train can travel 1136 miles in 4 hours. What is the unit rate that this train is traveling per hour? Write in miles per hour.
- Fertilizer 68694
0.6 l of fertilizer goes to 40 l of water. How much fertilizer should be put per 10 liters of water?
- A fan
A fan with a resistance of 20 Ω is connected to a power supply. The current flowing through the circuit is 2.5 A. What is the voltage of the power supply?
- Container 67524
What is the weight of a package of 12-liter milk cartons, one milk container weighs 80g?
- Transfers 67414
At the height of 80 cm above the road, a person transfers a stone weighing 2 kg parallel to it in a uniform motion along a path of 6 m in 10 s. With what power does it work?
- Average 67404
The stork moves to Africa for the winter for an average of 10 hours a day and flies around 650 km. At what average speed does the stork move?
- Calculate 66974
Calculate the density of the wood from which the statuette is made. Its volume is 32000 cm3, and it weighs 20800 g?
- Cross-section and coulombs
Determine the current flowing through the conductor if a charge of 150 C has passed through its cross-section in one minute.
- Conductor 66234
For how long does a charge of 600 C pass through the conductor at a current of 1 A.?
- Resistance 66074
Determine the current flowing through the car's starter, whose resistance is 60 milliohms at 12V
- Resistances 66064
Two resistors with resistances of 40 ohms and 60 ohms are connected in series and connected to a voltage of 150V. A) the total resistance B) current in the circuit C) voltage on both resistors
- Resistance 66054
The handset has a resistance of 4000 ohms. Calculate what voltage is connected to them if the current passes 2.5mA.
- Displayed 65694
Calculate the scale of the map, at which the actual distance of 12.6 km will be displayed as a distance of 2.52 cm.
- An aircraft 2
An aircraft jet engine has a thrust of 80 kN. What impulse is produced in 30 s?
- Children's 64844
An architect has two plans for the same apartment at different scales. On the first plan, with a scale of 1:20, the length of the children's room is 20 cm. What is the size of the children's room on the second plan with a scale of 1:50?