Answer:
v = 26.7 m/s
Explanation:
Given,
speed of the car = 20 m/s
distance between the car and the deer = 49 m
time taken to press the brake = 0.50 s
maximum deceleration of the car = 10 m/s²
Now,
distance travel by the car in 0.5 s = u x t = 20 x 0.5 = 10 m
distance travel by the car after the break is pressed
Using equation of motion
v² = u² + 2 a s
0² = 20² - 2 x 10 x s
s = 20 m
Total distance travel by the car = 20 + 10 = 30 m
Distance between deer and car = 49-30 = 19 m.
b. Maximum speed a car could have
Distance travel by the car in reaction time = v' x 0.5
v' is the maximum speed of the car.
maximum distance car can cover = 49 - 0.5 v'
Now, Using equation of motion
v² = u² + 2 a s
0² =v'² - 2 x 10 x (49- 0.5 x v')
v'² +10 v' -980 = 0
By solving
v = 26.7 m/s
Hence, maximum speed of the car can be 26.7 m/s
Answer:
60m/s
Explanation:
initial energy = final energy
g.p.e = k.e
k.e = 0.5 × mass × velocity²
g.p.e = 990000J as per Question
990000Nm = 0.5 × 550 × V²
V² = 3600
V = 60m/s
Ultrasound is vibrations, just like sound is vibrations. Ultrasound travels though the body just like sound would and when it hits something, it bounces back, where it is picked up by a receiver. which then makes an image out of it.
X-rays are electromagnetic waves, like visible light. Other examples of electromagnetic waves are infrared, and ultraviolet. But people cant see infrared nor ultraviolet, even though they are just like visible light. The difference between visible light and all these other kinds of light are just like the difference between red and blue. They are both light but different colors, ultraviolet and infrared are colors we cannot see, and in fact, we can see only a tiny portion of the colors out there. X-rays are just like all these kinds of light and we cant see it but it is able to go through most of the body, bot not bone. Doctors use x-rays to see bones and things like that in the body because x-rays won't pass through bone, but they will go through muscle and skin. So when a doctor takes an x-ray, its just like making a silhouette, but with colors we cant see. Of course, the x-rays make the photo paper change color and that's how we are able to see the image but the principle is the same.
