Themes, topics - math problems

Number of problems found: 1036

  • Bulb
    bulb _2 A 60 W bulb consumes 0.12 kWh of electricity. How long did she stand light without a break?
  • Hexagon = 8 parts
    stef.6.11.99 Divide the regular hexagon into eight equal parts.
  • Bob traveled
    house_3 Bob traveled 20 meters to Dave's house. He arrived in 3 minutes. What was his average speed for the trip.
  • Earth rotation
    earth_1 How fast is the place on the Earth's equator moving if the Earth's radius is 6378 km?
  • Friends
    country Five mates traveled and the journey they lasted 195 minutes. How long would travel only one of them?
  • Wave parameters
    frequency-and-wavelength Calculate the speed of a wave if the frequency is 336 Hz and the wavelength is 10 m.
  • RPM
    motor_rpm An electric motor makes 3,000 revolutions per minutes. How many degrees does it rotate in one second?
  • Decibel
    db A circuit has an input power of 58 mW. Its output power is 6 mW. What is the loss in decibels?
  • Wheelchair
    vozik 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
    cyclist What is the average speed of a cycle traveling at 20 km in 60 minutes in km/h?
  • Flowerbed
    flowers_9 Ondra digs the bed in 20 minutes. Cuba in 30 minutes. For how long do they dig together?
  • Speed of car
    car In 2 hours 40 mins, a car travels 100km. At what speed is the car traveling?
  • Decibel
    tv_1 By what percentage does the sound intensity increase if the sound intensity level increases by 1 dB?
  • Efficiency
    rychlovarna-kanvica What is the power output of kettle 2 kW with efficiency 90%?
  • Megapascals
    engine What is the area of crosssection of the piston, if the force of 300 kN produces a pressure of 5 MPa?
  • Three
    work Three pavers will pave the sidewalk in 4 days. How long does it take for two tiles to pave the same sidewalk?
  • Locomotive
    locomotive_1 Locomotive pulled a train permanent load of 200 kN horizontally along the track of 5km. What work it done?
  • Two resistors
    two_resistors Two resistors when they give 25 ohms in series and 4 ohms in parallel what the values of
  • Cyclist
    cyclist Cyclist drives 5 km in half an hour, how long will drive in 3 hours?
  • Transformer
    transformator 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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