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3 years ago

Can a car be moving at a constant speed and accelerating at the same time?

Physics

2 answers:

zvonat [6]3 years ago

7 0

I believe the answer is yes.

Dafna11 [192]3 years ago

7 0

An object can accelerate while traveling at constant speed but not at constant velocity.

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A ball is thrown straight down with a velocity of 12 m/s; what will be its velocity 2.0 s after being released?

hichkok12 [17]

Answer:

$v = 31.6m/s$

Explanation:

Given

$Initial\ Velocity, u = 12m/s$

$Time, t = 2.0s$

Required

Determine the final velocity, v

Using the first equation of motion

$v = u + at$

But in this case;

a = g = acceleration of gravity

So:

$v = u + gt$

Substitute values for u and t

$v = 12 + g * 2$

$v = 12 + 2g$

Take g as 9.8m/s²

$v = 12 + 2 * 9.8$

$v = 12 + 19.6$

$v = 31.6m/s$

Hence, the velocity is 31.6m/s

3 0

4 years ago

A measuring cylinder contains 60cm3 of oil at 0 celcius. When a piece of ice was roped into the cylinder it sank completely in o

mariarad [96]

Answer:

$S_i=\frac{9}{10} =0.9$

Explanation:

Given:

volume of oil in the cylinder, $V_o=60\ cm^2$

volume of the oil level when the ice is immersed, $V=90\ cm^3$

the volume level of oil when the ice melted, $V'=87\ cm^3$

Now, therefore the volume of ice:

$V_i=V-V_o$

$V_i=90-60$

$V_i=30\ cm^3$

Now the volume of water:

$V_w=V'-V_o$

$V_w=87-60$

$V_w=27\ cm^3$

As we know that the relative density is the ratio of density of the substance to the density of water.

So, the relative density of ice:

$S_i=\frac{\rho_i}{\rho_w}$ .....................(1)

as we know that density is given as:

$\rm \rho=\frac{mass}{volume}$

now eq. (1)

$S_i=\frac{m}{V_{i}}\div \frac{m}{V_w}$

where, m = mass of the water or the ice which remains constant in any phase

$S_i=\frac{V_w}{V_i}$

$S_i=\frac{27}{30}$

$S_i=\frac{9}{10} =0.9$

7 0

3 years ago

Arrange the planets from strongest magnetic field to weakest magnetic field. Jupiter Earth Venus

Karo-lina-s [1.5K]

The planets from strongest magnetic field to weakest magnetic field is Jupiter > Earth > Venus.

Magnetic fields are generated by the movement of magnetic material located in side the planet, usually at the core.

Jupiter, the biggest planet in our planetary system, likewise has the biggest magnetic field, producing a magnetosphere bigger than the Sun. It`s magnetic field is created by its fast rotation of 9.8 Earth hours. Dissimilar to Earth, Jupiter`s magnetic field is not produced by its core yet by interaction in its external core, which comprises of liquid metallic hydrogen.

Earth's magnetic field is produced by liquid metal at the center and Earth's fast pivot of 24 hours creates enough movement of the liquid to animate a magnetic field. While Venus does not have a magnetic field, likely on account of it's slow rate at around 243 Earth days, it's as yet shielded from sun oriented breezes utilizing an alternate kind of magnetism.

Therefore, the Jupiter have magnetic fields much stronger than that of the Earth and Venus.

4 0

3 years ago

Read 2 more answers

Explain why you cannot use mass or volume alone to identify substances.

Alex17521 [72]

Objects can have the same mass (but different compositions). Only mass or volume cannot tell you if the object is solid or volumes) or same volume (but different masses)

4 0

4 years ago

A block rides on a piston that is moving vertically with simple harmonic motion. (a) If the SHM has period 2.68 s, at what ampli

fredd [130]

Answer:

Part a)

$A = 1.78 m$