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2 years ago

Evaluate tan(249). O A. 1.36 B. 0.45 C. 0.41 D. 0.91

Physics

1 answer:

vodomira [7]2 years ago

3 0

Answer:

tan 249 = 2.61

tan 249 = tan (249 - 180) = tan 69 = 2.61

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mezya [45]

Answer:

46 dgres is the answer

Explanation:

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2 years ago

what was the initial temperature is 250 calories reply .1 kg of gold the final temperature of the gold was 175°c ? the specific

weqwewe [10]

Answer:

$115.2^{\circ}C$

Explanation:

When an amount of energy Q is supplied to a substance of mass m, the temperature of the substance increases by $\Delta T$ , according to the equation

$Q=mC_s \Delta T$

where $C_s$ is the specific heat capacity of the substance.

In this problem, we have:

$Q=250 \cdot 4.184 =1046 J$ is the amount of heat supplied to the sample of gold

m = 0.1 kg = 100 g is the mass of the sample

$C_s = 0.175 J/gC$ is the specific heat capacity of gold

Solving for $\Delta T$ , we find the change in temperature

$\Delta T = \frac{Q}{m C_s}=\frac{1046}{(100)(0.175)}=59.8^{\circ}$

And since the final temperature was

$T_f = 175^{\circ}$

The initial temperature was

$T_i = T_f - \Delta T= 175 -59.8=115.2^{\circ}C$

3 0

2 years ago

You are hungry and decide to go to your favorite neighborhood fast-food restaurant. You leave your apartment and take the elevat

Viktor [21]

Answer:

A) R = (200 i ^ + 100 j ^ + 30k ^) m , B) L = 223.61 m , C) R = 225.61 m

Explanation:

Part A

This is a vector summing exercise, let's take a Reference System where the z axis corresponds to the height (flights), the x axis is the East - West and the y axis corresponds to the North - South.

Let's write the displacements

Descending from the apartment

10 flights of 3 m each, the total descent is 30 m

Z = 30 k ^ m

Offset at street level

L1 = 0.2 i ^ km

L2 = 0.1 j ^ km

Let's reduce everything to the SI system

L1 = 0.2 * 1000 = 200 i ^ m

L2 = 100 j ^ m

The distance traveled is

R = (200 i ^ + 100 j ^ + 30k ^) m

Part B

The horizontal distance traveled can be found with the Pythagorean theorem for the coordinates in the plane

L² = x² + y²

L = √ (200² + 100²)

L = 223.61 m

Part C

The magnitude of travel, let's use the Pythagorean theorem for the sum

R² = x² + y² + z²

R = √ (30² + 200² + 100²)

R = 225.61 m

7 0

3 years ago

What is electron affinity?

Andrews [41]

Answer:

The electron affinity of an atom or molecule is defined as the amount of energy released when an electron is attached to a neutral atom or molecule in the gaseous state to form a negative ion.

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2 years ago

Part F A system experiences a change in internal energy of 14 kJkJ in a process that involves a transfer of 36 kJkJ of heat into

Molodets [167]

Answer:

Explanation:

According to first law of thermodynamics :

Q = ΔE + W

Q is heat added , ΔE is increase in the internal energy of the system and W is work done by the system .

Here Q = 36 KJ

ΔE = 14 kJ

Putting the values in the equation

36 = 14 + W

W = 36 - 14

= 22 kJ .

Work done by gas or system = 22 kJ.

3 0

2 years ago