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3 years ago

When talking about Acceleration ,what is significant about the about the sign(+ or -)?

Physics

1 answer:

OLEGan [10]3 years ago

5 0

Answer:

Acceleration at its most basic is the act of increasing your running speed. From a standing start (or blocks), you explode into action. If you’re already running, you pick up the pace. Acceleration continues until you can no longer increase your speed, at which point you achieve maximum velocity (top-end speed). Acceleration seems simple enough. The plus means your increasing speed, the k=minus means your decreasing in speed.

Explanation:

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A 600-g block is dropped onto a relaxed vertical spring that has a spring constant k =190.0 N/m. The block becomes attached to t

charle [14.2K]

Answer:

Work done will be 2.205 j

Explanation:

We have given that the spring is compressed b 37.5 cm

So d = 0.375 m

Mass of the block m = 600 gram = 0.6 kg

Acceleration due to gravity $g=9.8m/sec^2$

Gravitational force on the block $F=mg=0.6\times 9.8=5.88N$

Now we know that work done is give by $W=Fd=5.88\times 0.375=2.205J$

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3 years ago

In the following situations, which one does not have kinetic energy? A. a baseball in a catcher’s glove. . B. a lady walking slo

Lesechka [4]

Kinetic energy is the energy that an object possesses when it is in motion. In the given situations above, the one that does not have kinetic energy is option A. a baseball in a catcher's glove. This situation does not involve any motion because the ball is just being held. Options B,C and D are all in motion, which therefore possesses kinetic energy.

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3 years ago

A 2.3 kg block executes SHM while attached to a horizontal spring of spring constant 150 N/m. The maximum speed of the block as

aliya0001 [1]

Answer

given,

mass of block = m = 2.3 Kg

spring constant = k = 150 N/m

speed = 2.3 m/s

a) we know,

$\omega = \sqrt{\dfrac{k}{m}}$

$\omega = \sqrt{\dfrac{150}{2.3}}$

ω = 8.08 rad/s

v = A ω

2.3 = A x 8.08

A = 0.285 m

b) maximum acceleration

a = A ω²

a = 0.285 x 8.08²

a = 18.58 m/s²

c) acceleration is minimum at mean position the minimum value of acceleration is zero.

d) time period

$T = \dfrac{2\pi}{\omega}$

$T = \dfrac{2\pi}{8.08}$

T = 0.778 s

t = 4.1 x 0.7778

t = 3.188 s

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4 years ago

Which of the following statements about social connections today is most accurate?

Vlada [557]

Answer:

is point 2

Explanation:

There is a good cause for concern that technology will create social isolation

8 0

3 years ago

A calorimeter is a container that is insulated from the outside, so a negligible amount of energy enters or leaves the container

Len [333]

Answer:

This is a heat balance question with negligible heat losses to the surroundings.

Sum of heat losses = Sum of the heat gains

We are required to find the final temperature of the calorimeter system T1?

we were given

C = specific heat capacities of Copper c, Water w, Ice i and Lead l

m = masses as mc = 0.1kg, mw = 0.16kg, mi=0.018kg, ml=0.75kg,

T = Temperature of the components, Lead Tl= 225C and at ambient pressure, Temp. To of the water, ice and copper = 25C

Since, at thermal equilibrium after adding the Lead, the lead temperature Tl decreases while copper, water and ice temp decrease, so we have respective heat losses 'q' as,

qc + qw + qi + ql =0

which means that

(mc x Cc x ΔTC) + (mw x Cw x ΔTC) + (mi x Ci x ΔTC) + (ml x Cl x ΔTC) = 0

(0.1x390x (T1 - 25)) + (0.16x4190x (T1 - 25)) + (0.018x4190x (T1 - 0)) + (0.750x130x (T1 - 225)) = 0

882.32T1 - 41558 = 0

T1 = 47.1K

Hence, the final temperature of the calorimeter system is 47.1K

3 0

4 years ago

When talking about Acceleration ,what is significant about the about the sign(+ or -)?​

When talking about Acceleration ,what is significant about the about the sign(+ or -)?