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Y_Kistochka [10]

3 years ago

5

A book is sitting on a table, completely still. What would happen if gravity suddenly stopped affecting the book? A. The book wo

uld move upward. B. The book would stay where it is. C. The book would fall. D. The book would move sideways.

1 answer:

laila [671]3 years ago

6 0

B is correct answer.

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A white billiard ball with mass mw = 1.37 kg is moving directly to the right with a speed of v = 3.14 m/s and collides elastical

Ira Lisetskai [31]

That latest value for the Angle is in Grads, not in Kilograms.

Apply law of conservation of momentum along vertical direction.

$m_1v_1sin\theta_1-m_2v_2sin\theta_2=0$

$v_2=\frac{v_1sin\theta_1}{sin\theta_2}=\frac{sin54}{sin36}v_1 = 1.376v_1$

Apply law of conservation of momentum along the horizontal direction

$m_1u_1=m_1v_1cos\theta_1+m_2v_2cos\theta_2$

$u_1=v_1(cos\theta_1+1.376cos\theta_2)$

$u_1=v_1(cos(54)+1.376cos(36))$

$u_1=(1.7) v_1$

$v_1= \frac{3.14}{1.7}=1.84m/s$

The second ball velocity is $v_2 = (1.376)(1.84)=2.531m/s$

The magnitud of final total momentum is

$m(v_1+v_2)=(1.37)(2.531+1.84)=5.98kgm/s$

The magnitude of final energy is

$\frac{1}{2}m(v^2_1+v^2_2)=\frac{1}{2}(1.37)(2.531^2+1.84^2)=6.07J$

6 0

3 years ago

1. Which of the following types of energy is

Sholpan [36]

Answer:

Potential energy is stored energy and the energy of position––gravitational energy. There are several forms of potential energy. Electrical Energy is the movement of electrical charges. Everything is made of tiny particles called atoms.

5 0

2 years ago

Fill-in-the-Blank science questions! Extra points!

CaHeK987 [17]

11. Not sure, magnetic fields maybe? 12. Atmosphere 13. Rotation about the axis and wobble 14. Asteroids 15. Comets

6 0

3 years ago

Read 2 more answers

Which company has experienced censorship in China?

True [87]

Japan most of the time

4 0

3 years ago

Read 2 more answers

Some radio waves have a frequency of 4.8 × 10^9 Hz. Wave speed of electromagnetic waves = 3.0 × 10^8 m/s. Calculate the waveleng

Verizon [17]

Answer : The wavelength of the radio waves is $6.2\times 10^{-2}m$

Explanation : Given,

Frequency = $4.8\times 10^9 Hz$

Wave speed = $3.0\times 10^8 m/s$

As we know that the speed of a wave is related to its frequency and wavelength.

Formula used:

$\nu =f\times \lambda$

where,

$\nu$ is the wave speed in metres per second, (m/s )

f is the frequency in hertz, (Hz )

$\lambda$ is the wavelength in metres, (m)

Now putting all the given values in the above formula, we get:

$3.0\times 10^8 m/s=(4.8\times 10^9 Hz)\times \lambda$

$\lambda=6.2\times 10^{-2}m$

Therefore, the wavelength of the radio waves is $6.2\times 10^{-2}m$

7 0

3 years ago