a van moves with a constant speed of 79 km/h how long will it take to travel a distance of 502 kilometers

A 1250-kg compact car is moving with velocity v1 =36.2i^+12.7j^m/s. It skids on a frictionless icy patch and collides with a 448

MA_775_DIABLO [31]

Momentum is conserved, so the sum of the separate momenta of the car and wagon is equal to the momentum of the combined system:

(1250 kg) ((36.2 i + 12.7 j ) m/s) + (448 kg) ((13.8 i + 10.2 j ) m/s) = ((1250 + 448) kg) v

where v is the velocity of the system. Solve for v :

v = ((1250 kg) ((36.2 i + 12.7 j ) m/s) + (448 kg) ((13.8 i + 10.2 j ) m/s)) / (1698 kg)

v ≈ (30.3 i + 12.0 j ) m/s

7 0

2 years ago

11.

satela [25.4K]

a) mass

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8 0

3 years ago

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How many photons per second are emitted by a monochromatic lightbulb (650 nm) that emits 45 W of power? Express your answer usin

Fudgin [204]

Answer:

The number of photons per second are $7.95\times10^{11}\ photons/s$ .

Explanation:

Given that,

Wavelength = 650 nm

Power = 45 W

Distance R= 17 m

Diameter = 5.0 mm

We need to calculate the number of photon per second emitted by light bulb

Using formula of energy

$E=\dfrac{hc}{\lambda}$

The power is

$P=\dfrac{nE}{t}$

$\dfrac{n}{t}=\dfrac{P}{E}$

Put the value of E

$\dfrac{n}{t}=\dfrc{P \lambda}{hc}$

Put the value into the formula

$\dfrac{n}{t}=\dfrac{45\times650\times10^{-9}}{6.6\times10^{-34}\times3\times10^{8}}$

$\dfrac{n}{t}=1.47\times10^{20}\ photons/s$

We need to calculate the surface area

Using formula of area

$A=4\piR^2$

$A=4\pi\times17^2$

We need to calculate the number of photons entering into eye

$N=n\dfrac{A_{eye}}{A_{surface}}$

$N=1.47\times10^{20}\times\dfrac{\pi(2.5\times10^{-3})^2}{4\pi\times17^2}$

$N=7.95\times10^{11}\ photons/s$

Hence, The number of photons per second are $7.95\times10^{11}\ photons/s$ .

4 0

3 years ago

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When a bimetallic bar made of copper and iron strips is heated, it

Sidana [21]

Answer:

The bimetallic strip will bend to the iron's way since

When heated copper expands more than iron

Explanation:

bimetallic strips are temperature regulatory devices used to convert a temperature change into mechanical displacement.

It consists of two layers, usually iron and copper which layers are joined together to form the strip owing to the difference in the constants of expansion of the two materials, a flat strip will bend one way (toward the iron part) if heated. The linear thermal expansion coefficient relates the change in temperature to the change in a material's linear dimensions.

5 0

3 years ago

A horse canters away from its trainer in a straight line, moving 37 m away in 9.1 s. It then turns abruptly and gallops halfway

vesna_86 [32]

Answer:

Average velocity = 1.69 m/s

Average speed = 5.09 m/s

Explanation:

Given that

Horse cover 37 m in 9.1 sec and 18.5 m in 1.8 sec.

As we know that

Average velocity = Displacement / Total time

Average speed = Total distance / Total time

Average velocity:

Average velocity = Displacement / Total time

Total displacement = 37 - 18.5 = 18.5 m

Total time = 9.1 + 1.8 =10.9 s

Average velocity = Displacement / Total time

Average velocity = 18.5 / 10.9

Average velocity = 1.69 m/s

Average speed:

Average speed = Total distance/ Total time

Total distance = 37 + 18.5 = 55.5 m

Total time = 9.1 + 1.8 =10.9 s

Average speed = Total distance/ Total time

Average speed = 55.5 / 10.9

Average speed = 5.09 m/s

3 0

3 years ago