# Themes, topics - math problems

#### Number of problems found: 1036

- Bulb

A 60 W bulb consumes 0.12 kWh of electricity. How long did she stand light without a break? - Hexagon = 8 parts

Divide the regular hexagon into eight equal parts. - Bob traveled

Bob traveled 20 meters to Dave's house. He arrived in 3 minutes. What was his average speed for the trip. - Earth rotation

How fast is the place on the Earth's equator moving if the Earth's radius is 6378 km? - Friends

Five mates traveled and the journey they lasted 195 minutes. How long would travel only one of them? - Wave parameters

Calculate the speed of a wave if the frequency is 336 Hz and the wavelength is 10 m. - RPM

An electric motor makes 3,000 revolutions per minutes. How many degrees does it rotate in one second? - Decibel

A circuit has an input power of 58 mW. Its output power is 6 mW. What is the loss in decibels? - Wheelchair

The boy pushes the wheelchair with a force of F1 = 20N. The wheelchair exerts a force of F2 on the boy. How large is this force? - Cyclist 12

What is the average speed of a cycle traveling at 20 km in 60 minutes in km/h? - Flowerbed

Ondra digs the bed in 20 minutes. Cuba in 30 minutes. For how long do they dig together? - Speed of car

In 2 hours 40 mins, a car travels 100km. At what speed is the car traveling? - Decibel

By what percentage does the sound intensity increase if the sound intensity level increases by 1 dB? - Efficiency

What is the power output of kettle 2 kW with efficiency 90%? - Megapascals

What is the area of crosssection of the piston, if the force of 300 kN produces a pressure of 5 MPa? - Three

Three pavers will pave the sidewalk in 4 days. How long does it take for two tiles to pave the same sidewalk? - Locomotive

Locomotive pulled a train permanent load of 200 kN horizontally along the track of 5km. What work it done? - Two resistors

Two resistors when they give 25 ohms in series and 4 ohms in parallel what the values of - Cyclist

Cyclist drives 5 km in half an hour, how long will drive in 3 hours? - Transformer

Transformer - U1 = 230 V, N1 = 300, N2 = 1,200, I1 = 4 A. Calculate the transformation ratio, voltage and current in the secondary coil.

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