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? asked in Science & MathematicsPhysics · 8 years ago

physics questions please help?

please show me how its done...:)

1) find the resultant of the ff. displacements of a car: 50 km north, 40 km East, and 30 km South.

2)a stone is dropped from a window of a tall building & falls for 3s before it hits the ground. How tall is the building? What is the speed of the stone?

3) How much work is done in lifting a 60 kg sack of rice to a distance of 10 m?

4)Calculate the power needed by a crane to raise a 400 kg crate to a height of 16 m in 1 minute?

thanks a lot for your answers i just got confused by these questions..:),

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  • Anonymous
    8 years ago
    Favorite Answer

    1) in fact it moves 20 km North and 40 km East. so

    20^2+40^2=X^2 x=20√5

    2) (g=10 m/s^2) Height is 35 m and the speed is 30 m/s

    3) a parameter is missing , you have to have the Acceleration to calculate the Force then W=F.D

    4) (g=10 m/s^2) also a missing one , the minimum force needed to lift the crate is F>= 4000 N

    so it depends on the force

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