Themes, topics - math word problems - page 35 of 168

Number of problems found: 3360

The electric motor
The electric motor winding's copper wire (alpha=4*10^-3 1/K) has a resistance of 42 ohms at a temperature of 18 degrees. What is its resistance at an operating temperature of 50 degrees?
Nikelin and brass
Calculate the length of brass wire (ró=0.08 microohm m) and nickel (ró=0.4 microohm m) with a diameter of 0.5 mm, which has a resistance of 1 ohm
Cooker wire resistivity
The heating coil of the cooker has a resistance of 70.5 ohms and is made of a wire with a diameter of 0.30 mm and a length of 9.8 m. Determine the resistivity of the material from which it is made.
Glass sheet weight
What is the weight of a sheet of glass 75 cm x 120 cm and 2 mm thick if one cubic meter of glass weighs 2500 kilograms?
Wire charge current
A constant current of 80mA passes through the wire. What charge passes through the conductor in 1 h?
Source voltage resistance
Determine the source voltage to which we must connect a 1k ohm resistance wire if a current of 40 mA is to flow through it.
Bulb filament resistance
A current of 0.2 A flows through a light bulb connected to a voltage of 6 V. What is the resistance of the red-hot filament?
LED resistor current
Calculate the current I that would race through resistor R5 (720 ohms), resistor R2 (220 ohms), and an LED (U=2V) at a DC 6V source. The resistors are connected in series.
Tourist group distance
A group of tourists split up at the intersection of two perpendicular paths. One group walked at a speed of 5.3 km/h. Second group 4.1km/h. How far were the two groups from each other after 1h 25min?
Cycling trip fractions
The Malíkova family plans a 120 km cycling trip for 4 days. They want to cover a quarter of the entire route on the first day. The second day, 2/15, and the third day, 7/20, will cover the entire length of the trip. What part of the trip will they cover i
Instructor team pursuit
On the school ski trip, the team set off from hut A at 9:30 a.m. to hut B at a speed of 2 m/s. Fifteen minutes later, the instructor followed them at a speed of 3 m/s. At what time and distance from cabin A will the instructor catch up with the team? Plea
Almond fat daily
The daily need for fat for a person is 80g on average. Almonds contain 45% fat. How many grams of almonds would a person have to eat if he wanted to cover his daily need for fats by eating only almonds?
Milk butter fat
Cow's milk contains an average of 3.6% fat. How many liters of milk are needed to make 250g of butter? Butter contains 82% fat.
Bread apple carbohydrate
Bread contains an average of 52% carbohydrates, and apples have 12% carbohydrates. How many apples weighing 220g would you have to eat to get as much carbohydrate as 150g of bread?
To convert
To convert from a Celsius temperature to a Fahrenheit temperature, multiply the Celsius temperature by 9/5 and add 32. Which is the Fahrenheit temperature corresponding to - 30 degrees Celsius?
Square diagonal drawing
Draw a square EFIJ if EI is equal to 7cm.
The temperature 37
The temperature was –5°C last night. It is increased to 8°C in the afternoon. What was the change in temperature?
Cyclist average speed
The cyclist covered a distance of 143 km in 5.5 hours. What was the cyclist's average speed?
Kilometers - subway
A subway train covers a distance of 1.4 km between two adjacent stations in 1 minute 40 seconds. What is her average speed? Give the result in kilometers per hour and meters per second.
Circuit current calculation
We connect a 9V battery, 2 light bulbs in parallel, and a switch to the circuit. When the switch is turned on, a current of 0.5 A passes through the first bulb and a current of 8 A through the unbranched part of the circuit. Draw the connection and calcul

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