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WITCHER [35]
3 years ago
11

A car is moving down a flat, horizontal highway at a constant speed of 21 m/s when suddenly a rock dropped from rest straight do

wn from a bridge crashes through the windshield. The rock strikes the windshield at a right angle, and the windshield makes a 60 degree angle with the horizontal.
a. Find the speed of the rock relative to the car when it hits the windshield.
b. Find the distance above the point of contact with the windshield from which the rock was dropped.
c. If the driver had seen what was about to happen just as the rock was being released, how much time would she have had to react before the rock strikes the windshield?
Physics
1 answer:
Naddik [55]3 years ago
7 0

Answer:

a)9.8

Explanation:

because any object falling from any height is 9.8

(sorry that's the only one i know)

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Can someone explain how the weight of the block is 10.26N, with reference to an appropriate law of motion?
spayn [35]

this process is called parellelogram method of resolving vectors.

5 0
3 years ago
the ratio of the energy per second radiated by the filament of a lamp at 250k to that radiated at 2000k, assuming the filament i
Naily [24]

Answer:

(a) \frac{P_{250k}}{P_{2000k}}=2.4\ x\ 10^{-4}

(b) P =  0.816 Watt

Explanation:

(a)

The power radiated from a black body is given by Stefan Boltzman Law:

P = \sigma AT^4

where,

P = Energy Radiated per Second = ?

σ = stefan boltzman constant = 5.67 x 10⁻⁸ W/m².K⁴

T = Absolute Temperature

So the ratio of power at 250 K to the power at 2000 K is given as:

\frac{P_{250k}}{P_{2000k}}=\frac{\sigma A(250)^4}{\sigma A(2000)^4}\\\\\frac{P_{250k}}{P_{2000k}}=2.4\ x\ 10^{-4}

(b)

Now, for 90% radiator blackbody at 2000 K:

P = (0.9)(5.67\ x\ 10^{-8}\ W/m^2.K^4)(1\ x\ 10^{-6}\ m^2)(2000\ K)^4

<u>P =  0.816 Watt</u>

7 0
3 years ago
Have the highest birth rate
Sveta_85 [38]

Answer:

353225

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3 0
3 years ago
a man carries a hand bag by hanging on his hand and moves horizontally where the bag does not move up or down. What is the work
Savatey [412]

The work done by the man is the product of his applied force and the displacement of the bag and the man gets tired because his internal energy has be converted to work.

<h3>What is work done by the man?</h3>

The work done by the man is the product of his applied force and the displacement of the bag.

<h3>Why the man gets tired</h3>

The man gets tired because his internal energy has be used to do work on the bag.

Thus, the work done by the man is the product of his applied force and the displacement of the bag and the man gets tired because his internal energy has be converted to work.

Learn more about work done here: brainly.com/question/8119756

#SPJ1

4 0
1 year ago
According to the Creative Curriculum model, the _____ sets the context for teaching and learning
vladimir2022 [97]

Answer:

A. structure of the classroom

Explanation:

According to the Creative Curriculum model, the _ structure of the classroom_ sets the context for teaching and learning.  

In creative curriculum model children learn through creative and active learning strategy. Creative curriculum are implemented through structure of classrooms. Creative curriculum stands to enhance skill of the the students and inculcate in them passion for learning.

3 0
3 years ago
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