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3 years ago

12

The temperature of a 5.0 kg block increases by 3 degrees C when 2,000 J of thermal energy are added to the block. What is the sp

ecific heat of the block? _____________

1 answer:

Katena32 [7]3 years ago

3 0

Answer:

133.33J/kg°C

Explanation:

Given parameters:

Mass = 5kg

Temperature change = 3°C

Thermal energy = 2000J

Unknown:

Specific heat of the block = ?

Solution:

To find the specific heat capacity, use the formula below;

H = mCФ

where H is amount of heat

m is the mass

C is the specific heat capacity

Ф is the temperature change

Input the parameters and solve;

2000 = 5 x C x 3

C = $\frac{2000}{15}$

C = 133.33J/kg°C

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The author’s feeling about a subject or topic, which is evidenced in word choice, is called __________.

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The author’s feeling about a subject or topic, which is evidenced in word choice, is called tone. <span>They could be literal meanings which are meanings explicitly given to the readers or the person being told to. In this type of meaning, the person doesn’t need to think the words too much or ponder on the meaning because they could easily understand what the other person or the author implies. Meanwhile connotative meanings are meanings using different figures of speech or symbolism that the person still needs to think it over before knowing the actual meaning of the word, sentence or story.</span>

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4 years ago

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A mass of 6 kg with initial velocity 16 m/s travels through a wind tunnel that exerts a constant force 8 N for a distance 1.6 m.

strojnjashka [21]

Answer:

$D=99.4665307m \approx 99.5m$

Explanation:

From the question we are told that

Mass $m=6kg$

Velocity of mass $V_m=16$

Force of Tunnel $F_t=8N$

Length of Tunnel $L_t=1.6$

Height of frictional incline $H_i=2.9$

Angle of inclination $\angle =16 \textdegree$

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

First Frictional surface has a coeﬃcient $\alpha_1 =0.21\ for\ d_c=1$

Second Frictional surface has a coeﬃcient $\alpha _2=0.1$

Generally the initial Kinetic energy is mathematically given by

$K.E=\frac{1}{2}mv^2$

$K.E=\frac{1}{2}(6)(16)^2$

$K.E=768$

Generally the work done by the Tunnel is mathematically given as

$w_t=F_t*d_t$

$w_t=8*1.6$

$w_t=12.8J$

Therefore

$Total energy\ E_t=Initial\ kinetic energy\ K.E*Work done\ by\ tunnel\ W_t$

$E_t=K.E+E_t\\E_t=768J+12.8J$

$E_t=780.8J$

Generally the energy lost while climbing is mathematically given as

$E_c=mgh$

$E_c=(6)(9.8)(2.9)$

$E_c=170.52J$

Generally the energy lost to friction is mathematically given as

$E_f=\alpha *m*g*cos\textdegree*d_c$

$E_f=0.21*6*9.8*cos16*1$

$E_f=11.86965942 \approx 12J$

Generally the energy left in the form of mass $Em$ is mathematically given as

$E_m=E_t+E_c+E_f$

$E_m=(768J)-(170.52)-(12)$

$E_m=585.48J$

Since

$E_m=\alpha_2*g*m*d$

Therefore

It slide along the second frictional region

$D=\frac{585.46}{0.1*9.81*6}$

$D=99.4665307m \approx 99.5m$

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3 years ago

A 4-watt night light is left on for 8 hours each night. How much work dies it do per night

ki77a [65]

The light bulb doesn't do any "work" ... it doesn't exert force,
or maintain a force through a distance. It does, however,
dissipate energy, in the form of heat and light.

The quantity of energy that it dissipates is ...

(4 watts) x (8 hours) x (3600 sec/hour) x (1 joule/watt-sec)

= (4 x 8 x 3600) joules = 115,200 joules .

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A father wants his son to start helping his mother do the do laundry. According to social learning theory, the father should

telo118 [61]

Answer:

Help out with the laundry himself.

Explanation:

In social learning theory, it's a process where people tend to observe the actions of others and then imitate them.

Now, since this father wants to teach his son to start helping his mother do the do laundry, what he can do according to social learning theory is to help with the laundry himself first.

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3 years ago

What is the dimensional formula of force and torque

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Answer:

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Dimension: M L2T−2

In SI base units: kg⋅m2⋅s−2

Other units: pound-force-feet, lbf⋅inch, ozf⋅in

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3 years ago

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