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4 years ago

What are the SI units for work? A. Calories B. Watts C. Ergs D. Joules

Physics

2 answers:

fenix001 [56]4 years ago

8 0

D Juuls is the Si unit for work.

SOVA2 [1]4 years ago

3 0

Joules is the SI units for work.

Answer: Option D

Explanation:

In the metric system, which is a common nomenclature for the standard representation of measurements to avoid confusions and errors, the unit of work is joule.

Work is referred as the amount of energy spent by a force. SI stands for International system of units. Option A,B and C are irrelevant because watts is used to represent power, and calories are used to represent the energy spent.

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A tennis player tosses a tennis ball straight up and then catches it after 2.00 s at the same height as the point of release. (a

Readme [11.4K]

Answer:

Part a)

a = -9.81 m/s/s

Part b)

v = 0

Part c)

v = 9.81 m/s

Part d)

$H = 4.905 m$

Explanation:

Part a)

During the motion of ball it will have only gravitational force on the ball

so here the acceleration of the ball is only due to gravity

so it is given as

$a = g = 9.81 m/s^2$

Part b)

As we know that ball is moving against the gravity

so here the velocity of ball will keep on decreasing as the ball moves upwards

so at the highest point of the motion of the ball the speed of ball reduce to zero

$v_f = 0$

Part c)

We know that the total time taken by the ball to come back to the initial position is T = 2 s

so in this time displacement of the ball will be zero

$\Delta y = 0 = v_y t + \frac{1}{2} at^2$

$0 = v_y (2) - \frac{1}{2}(9.81)(2^2)$

$v_y = 9.81 m/s$

Part d)

at the maximum height position we know that the final speed will be zero

so we will have

$v_f^2 - v_i^2 = 2 a d$

here we have

$0 - (9.81^2) = 2(-9.81)H$

$H = 4.905 m$

4 0

3 years ago

A total electric charge of 6.75 nC is distributed uniformly over the surface of a metal sphere with radius 20.0 cm. If the poten

djverab [1.8K]

Answer:

a) 60 V

b) 125 V

c) 125 V

Explanation:

Given

We are given the total electric charge q = 6.75 nC = 6.75x 10^-9 C distributed uniformly over the surface of a metal sphere with a radius of R = 20.0 cm = 0.020 m.

Required

We are asked to calculate the potential at the distances

(a) r = 10.0 cm

(b) r = 20.0 cm

Solution

(a) Here, the distance r > R so, we can get the potential outside the sphere (r > R) where the potential is given by

V = q/4 $\pi$ ∈_o (1)

r is the distance where the potential is measured and the term 1/4 $\pi$ ∈_o equals 9.0 x 10^9 Nm^2/C^2. Now we can plug our values for q and r into equation (1) to get the potential V where r = 0.10 m

V= 1*q/4 $\pi$ ∈_o*r

=60 V

(b) Here the distance r is the same for the radius R, so we can get the potential inside the sphere (r = R) where the potential is given by

V = 1*q/4 $\pi$ ∈_o*R (2)

Now we can plug our values for q and R into equation (2) to get the potential V where R = 0.20 m

V = 1*q/4 $\pi$ ∈_o*R

= 125 V

(c) Inside the sphere the electric field is zero therefore, no work is done on a test charge that moves from any point to any other point inside the sphere. Thus the potential is the same at every point inside the sphere and is equal to the potential on the surface. and it will be the same as in part (b)

V= 125 V

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3 years ago

A 9 volt battery produces a current of 0.2A. What is the resistance?

nekit [7.7K]

9/0.2 would be the ans

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4 years ago

Select the correct answer. Samuel adds a teaspoon of salt to a glass of water. He notices that the salt disappears. Samuel takes

borishaifa [10]

Answer:

Explanation:

A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. Therefore it can not be any of the other answers because the substance was water at first but now its salty water.

ps what kind of person would drink water after you put salt in it lol.

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3 years ago

If you wanted to get yellow light , what part of the of the spectrum would the color filter have to absorb ?

densk [106]

The filter would need to absorb every color EXCEPT yellow. It would have to absorb red orange green blue and violet.

4 0

3 years ago