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vladimir2022 [97]

3 years ago

11

Một con lắc lò xo dao động điều hoà theo phương thẳng đứng, trong quá trình dao động của vật lò xo có chiều dài biến thiên từ 20

cm đến 28cm. Biên độ dao động của vật là

1 answer:

san4es73 [151]3 years ago

6 0

Answer:

6738eyuieouhdgcycyeiojhyrvvbbgdgdiokfjbdbhhdhdhcjviriwdhycyfjfkkdofjrjfufjjrhrhfuvuvirie884727eugig8gjfhenekwkekfjvubkdjejdn

Explanation:

buang ka

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Which of the following is the most reasonable weight in units of newtons for an average adult?

Oliga [24]

Answer: The reason weight for average adult is 530N

Explanation: The clearly see this answer, let's convert this weight to kg using F=mg

530=m×9.8

g is a constant of 9.8m/s2

We divide both sides by 9.8 to get

54kg then this weight is reasonable for an average adult.

7 0

4 years ago

Read 2 more answers

The two conducting rails in the drawing are tilted upwards so they each make an angle of 30.0° with respect to the ground. The v

dolphi86 [110]

Answer:

The current flows through the rod is 14.9 A.

Explanation:

Given that,

Magnetic field = 0.045 T

Mass of aluminum rod = 0.19 kg

Length = 1.6 m

Angle = 30.0°

We need to calculate the force

Using resolving force

$F\cos\theta=mg\sin\theta$

$F=mg\tan\theta$

Put the value into the formula

$F=0.19\times9.8\times\tan30$

$F=1.075\ N$

We need to calculate the current flows through the rod

Using formula of magnetic force

$F=iLB$

$i=\dfrac{F}{LB}$

Put the value into the formula

$i=\dfrac{1.075}{1.6\times0.045}$

$i=14.9\ A$

Hence, The current flows through the rod is 14.9 A.

8 0

3 years ago

A particle of mass 4.0 kg is constrained to move along the x-axis under a single force F(x) = −cx3 , where c = 8.0 N/m3 . The pa

Pie

Answer:4.58 m/s

Explanation:

Given

mass of Particle $m=4 kg$

$F=-cx^3$

$a=\frac{F}{m}$

$a=-\frac{cx^3}{m}$

$a=-\frac{8x^3}{4}$

$a=-2x^3$

$v\frac{\mathrm{d} v}{\mathrm{d} x}=-2x^3$

$vdv=-2x^3dx$

integrating

$\int_{6}^{v_b}vdv=\int_{1}^{-2}-2x^3dx$

$\frac{v_b^2-6^2}{2}=-\frac{1}{2}\left [ \left ( -2\right )^4-\left ( 1\right )^4\right ]$

$\frac{v_b^2-36}{2}=-0.5\times 15$

$v_b^2=36-15$

$v_b=\sqrt{21}$

$v_b=4.58 m/s$

6 0

3 years ago

A ball that occupies 20cm^3 of space is half submerged, very gently, in a full glass of water. How much volume of water spills o

egoroff_w [7]

Answer:

Spills out 10cm³ of wather.

Explanation:

The ball being submerged halfway in the full glass of water will spill a volume of water equal to the volume of the ball that is being submerged, because the entire volume of the submerged ball was previously occupied by water and is not compressed should move out of the glass.This volume will be 10cm³ since the total of the ball is 20cm³ and it is submerged halfway.

8 0

3 years ago

Why does a box on the seat of a car slide around on the c one the car speeds up slows down or turns a corner?

Feliz [49]

Because the box keeps going straight at the same speed, while the seat under it speeds up, slows down, or changes direction.

8 0

3 years ago