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

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