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Vsevolod [243]
3 years ago
8

An object is moving along a straight line. The graph shows the velocity of the object over

Physics
2 answers:
iren [92.7K]3 years ago
8 0

Answer:

From 9 to 10 sec the velocity is decreasing at a constant rate.

Change in V = 20 m/s - 30 m/s = -10 m/s

Since acceleration is constant from point E to point F (straight line)

and t = 9.5 sec is on this line

a = (20 m/s - 30 m/s) / 1 sec = -10 m/s^2  

IRISSAK [1]3 years ago
4 0

Answer:

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Explanation:

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A coaxial cable consists of alternating coaxial cylinders of conducting and insulating material.
olga2289 [7]

Answer:

True

Explanation:

A coaxial cable is a type of cable that has an inner conductor surrounded by an insulating layer, surrounded by a conductive shielding.

4 0
3 years ago
Which of the following describes swinging a bat
Serjik [45]
There is no suitable description on the list you provided.
6 0
4 years ago
A student performs a lab measuring the velocities of toy cars of different masses
stiv31 [10]
The answer is Car 1 and Car 2.
5 0
4 years ago
Read 2 more answers
A coffee-cup calorimeter is used to determine the heat of reaction for the reaction of compound A with compound B. A(aq) + B(aq)
Sergeeva-Olga [200]

Answer:

\rm 1.64\times 10^{3}\; J.

Explanation:

Assume that his calorimeter is sufficiently effective, such that no heat had escaped to the surroundings. Heat from this solution would be absorbed by either

  • the solution, or
  • the coffee cup.

Temperature change: 33.637 - 23.722 = \rm 9.915\; ^\circ C.

<h3>Heat absorbed by the solution:</h3>

Only the specific heat capacity (per unit mass) of the solution is given. Both the mass of the solution and the temperature change will be required for determining the energy change. Start by finding the mass of the solution.

m = \rho \cdot V = 2\times 16.10 \times 1.00 = \rm 32.10\; g.

Calculate the amount of heat absorbed from the specific heat:

Q = c\cdot m \cdot \Delta T = 4.814\times 32.10 \times 9.915 = \rm 1335.80\; J.

<h3>Heat absorbed by the coffee cup:</h3>

The heat capacity of the coffee cup is given. Only the temperature change will be required for finding the amount of heat absorbed.

Q = C\cdot \Delta T = \rm 30.7\times 9.915 = 304.391\; J.

<h3>Heat that this reaction produces</h3>

Find the sum of the two parts of heat. Round to three significant figures as in the heat capacity of the coffee cup and the density of the solution.

\rm 1335.80+ 304.391 = 1.64\times 10^{3}\; J.

8 0
4 years ago
A water wave passes by a floating leaf that is made to oscillate up and down two complete cycles each second, which means that t
lina2011 [118]

Answer:

2 Hz.

Explanation:

Frequency is simply defined as the number of appearances of a periodic event occurring per time. It is usually measured in cycles/second.

Now, in this question, we are told that there are 2 cycles for each second.

Thus, we can say that the frequency is 2 cycles/1 s = 2 Hz.

7 0
3 years ago
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