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aleksklad [387]
3 years ago
7

A man on a beach measures 2 seconds and 5 meters between two crests. what is the wave speed?

Physics
1 answer:
zzz [600]3 years ago
5 0
I believe it would be 2.5 meters a second

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A hawk flying at 11 m/s at an altitude of 132 m accidentally drops its prey. The parabolic trajectory of the falling prey is des
WITCHER [35]

Answer:

s = 153.34 m

Explanation:

given,

speed of hawk flying = 11 m/s

altitude = 132 m

equation of parabolic trajectory

y = 132 -\dfrac{x^2}{33}............at y = 0    x =66

ds=\sqrt{dx^2+dy^2}

ds=dx\sqrt{1+(\dfrac{dy}{dx})^2}

\dfrac{dy}{dx}=\dfrac{-2x}{33}

ds=dx\sqrt{1+(\dfrac{-2x}{33} )^2}

ds=dx\sqrt{1+(\dfrac{4x^2}{1089} )}

integrating

s = \int _0^66\sqrt{1+(\dfrac{4x^2}{1089} )}

using formula

\sqrt{x^2+a^2}=\dfrac{x}{2}\sqrt{x^2+a^2}+\dfrac{a^2}{2}log|x+\sqrt{x^2+a^2}|

s = 153.34 m

3 0
3 years ago
When monochromatic light illuminates a grating with 7000 lines per centimeter, its second order maximum is at 62.4°. what is the
zhannawk [14.2K]

When red light illuminates a grating with 7000 lines per centimeter, its second maximum is at 62.4°. What is the wavelength of this light?

ans: 633nm

6 0
4 years ago
Read 2 more answers
A _____ is a device that uses a smaller current to control a larger current. fuse rheostat relay switch circuit breaker
lbvjy [14]

Answer:

relay switch

Explanation:

relay switch is the answer

4 0
3 years ago
For an advanced lab project you decide to look at the red line in the Balmer series. According to the Bohr Theory, this is a sin
Alik [6]

Answer:

1.000153 T

Explanation:

The energy change ΔE = hc(1/λb - 1/λa)

= 6.626069 ✕ 10⁻³⁴ J · s 2.997925 × 10⁸ m/s(1/6.544750 × 10⁻⁷ m - 1/6.544550 × 10⁻⁷ m)

= 19.864457907 × 10⁻²⁶(1527942.2438 - 1527988.9374) = 19.864457907 × 10⁻²⁶(-46.6936)

= 927.543052 × 10⁻²⁶

= -9.275431× 10⁻²⁴ J.

This energy change ΔE = 2μBB. So the magnetic field, B is

B = ΔE/2μB where μB = 9.274009 ✕ 10⁻²⁴ J/T

B = -9.275431× 10⁻²⁴ J/9.274009 ✕ 10⁻²⁴ J/T = -1.000153 T

The magnitude of the magnetic field B = 1.000153 T

5 0
3 years ago
Roger the turtle moved 450 m in 2 hours the first day and the next day he moved in a straight line at a steady speed of 15 cm/s
Sonja [21]

Answer:

a). Roger travel total a distance of 2070m

b). The average speed of the whole tip V_{p}0.16025\frac{m}{s}

Explanation:

V= \frac{x}{t} = \frac{450m}{2 hr} * \frac{1 hr}{3600 s}  = \frac{450m}{7200 s}\\ V= \frac{450m}{7200s} =0.125 \\V= 0.0625 \frac{m}{s} \\

a).

First trip 450m

Second trip :

V=\frac{x}{t} \\x=V*t \\x= 15 \frac{cm}{s} *3 hr\\x= 15 (\frac{cm}{s}*\frac{1m}{100 cm}) * 3 hr (\frac{3600s}{1hr})\\  x=0.15 \frac{m}{s}  * 3600s\\x= 1620 m

So final distance is

450m+1620m=2070m

b).

V_{p} = \frac{0.15 \frac{m}{s}+0.0625 \frac{m}{s} }{2} =0.10625 \frac{m}{s}

The average speed is V_{p}0.10625 \frac{m}{s}

8 0
3 years ago
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