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3 years ago

9

A roller coaster track is 3,000 meters long.It takes 100 seconds to travel once around the roller coaster.Is the velocity consta

nt throughout the trip?Explain.

1 answer:

Ira Lisetskai [31]3 years ago

7 0

No.

Roller coasters are never at a constant velocity.

If you remove the stop and start time of the roller coaster the dips increase velocity and the hills decease it.

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Consider a traveling wave described by the formula

Harrizon [31]

Answer:

The wave is traveling in the +x direction.

Explanation:

The equation of a wave is given by the formula as :

$y(x,t)=A\ sin(kx-\omega t)$

Here,

A is the amplitude of wave

$(kx-\omega t)$ is the phase of wave

$\omega$ is the angular frequency of the wave

We need to find the correct statement out of given options. The given equation can be rewritten as :

$y(x,t)=A\ sin(\omega t-kx)$

Here, the propagation constant is negative. So, the wave is moving in +x direction. Hence, the correct option is (a).

4 0

4 years ago

A horizontal mass-spring system is in SHM. The mass is 0.25kg, the spring constant is 15N/m, and the amplitude is 20cm. a)What i

Alex_Xolod [135]

Answer:

maximum speed = 1.55 m/s

speed is 0.775 m/s

Explanation:

given data

mass m = 0.25 kg

spring constant k = 15 N/m

amplitude A = 20 cm = 0.2 m

to find out

maximum speed and speed at the 1/2 amplitude

solution

we know formula for maximum speed that is

maximum speed = amplitude ×√(k/mass)

put all value

maximum speed = 0.2 ×√(15/0.25)

maximum speed = 1.55 m/s

and

at the 1/2 amplitude

we apply here conservation of energy that is

1/2 × m×v² = 1/2 × k×x²

here we know x = A/2 that is 20 /2 = 10 cm = 0.1 m

so

0.25 v² = 15 × 0.1²

v² = 0.600625

v = 0.775

so speed is 0.775 m/s

3 0

3 years ago

Which Sl units are combined to describe energy?

azamat

Answer:

kilograms and m²/s²

Explanation:

The SI units combined to describe energy is kilograms and m²/s² ;

Energy can be derived from;

Potential energy = mgh

Units = kg x m/s² x m

= kg m²/s²

Even if we use kinetic energy, we still get kg m²/s²

5 0

3 years ago

The speed of light is about 3.00 × 10 meters per second. What is the frequency of green light that has a wavelength about 500 na

RideAnS [48]

Answer:

The frequency of the green light is $6x10^{14}Hz$

Explanation:

The visible region is part of the electromagnetic spectrum, any radiation of that electromagnetic spectrum has a speed of $3.00x10^{8}m/s$ in the vacuum.

Green light is part of the visible region. Therefore, the frequency can be determined by the following equation:

$c = \lambda \cdot \nu$ (1)

Where c is the speed of light, $\lambda$ is the wavelength and $\nu$ is the frequency.

Notice that since it is electromagnetic radiation, equation 1 can be used. Remember that light propagates in the form of an electromagnetic wave (that is a magnetic field perpendicular to an electric field).

Then, $\nu$ can be isolated from equation 1

$\nu = \frac{c}{\lambda}$ (2)

Notice that it is necessary to express the wavelength in units of meters.

$\lambda = 500nm . \frac{1m}{1x10^{9}nm}$ ⇒ $5x10^{-7}m$

$\nu = \frac{3.00x10^{8}m/s}{5x10^{-7}m}$

$\nu = 6x10^{14}s^{-1}$

$\nu = 6x10^{14}Hz$

Hence, the frequency of the green light is $6x10^{14}Hz$

4 0

4 years ago

In a cell what substance is analogous to a factory manger and where would it be found?

charle [14.2K]

The substance is DNA and it would be found in the nucleus.

5 0

3 years ago