Themes, topics - math word problems
Number of problems found: 988
- Gold horseshoe
Calculate the volume of a gold horseshoe that weighs 750g.
A 60 W bulb consumes 0.12 kWh of electricity. How long did she stand light without a break?
- 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?
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.
An electric motor makes 3,000 revolutions per minutes. How many degrees does it rotate in one second?
A circuit has an input power of 58 mW. Its output power is 6 mW. What is the loss in decibels?
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?
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?
By what percentage does the sound intensity increase if the sound intensity level increases by 1 dB?
What is the power output of kettle 2 kW with efficiency 90%?
What is the area of crosssection of the piston, if the force of 300 kN produces a pressure of 5 MPa?
Locomotive pulled a train permanent load of 200 kN horizontally along the track of 5km. What work it done?
- Working together
One worker performs work in 3 days, the second in 5 days. How much do they work together?
- Two resistors
Two resistors when they give 25 ohms in series and 4 ohms in parallel what the values of
Cyclist drives 5 km in half an hour, how long will drive in 3 hours?
Transformer - U1 = 230 V, N1 = 300, N2 = 1,200, I1 = 4 A. Calculate the transformation ratio, voltage and current in the secondary coil.