The energy increases 9 times !!! From KE=1/2mv^2
Answer: v= 0.2m/s
Explanation:
from Doppler effect
f = (2v/c) * fo
where:
f = the max beat frequency between two signals
fo = the emitted signal frequency from the organ.
v= The max speed of the organ tissue
c= 1540m/s (speed of Ultrasound wave in human tissue)
substituting the values, we have
520 Hz/ 2000000Hz = 2v/1540m/s
simplifying,
2v = (520 x 1540)/2000000
2v = 0.4004
v = 0.4/2 = 0.2 m/s
The max speed of the heart tissue is 0.2m/s
The answer is a. Mars and jupiter
True, if you move something forward at 100 miles an hour but your on something moving backwards 100 miles an hour you up staying in the same location, aka zero velocity.
Answer:
The speed of the block is 8.2 m/s
Explanation:
Given;
mass of block, m = 2.1 kg
height above the top of the spring, h = 5.5 m
First, we determine the spring constant based on the principle of conservation of potential energy
¹/₂Kx² = mg(h +x)
¹/₂K(0.25)² = 2.1 x 9.8(5.5 +0.25)
0.03125K = 118.335
K = 118.335 / 0.03125
K = 3786.72 N/m
Total energy stored in the block at rest is only potential energy given as:
E = U = mgh
U = 2.1 x 9.8 x 5.5 = 113.19 J
Work done in compressing the spring to 15.0 cm:
W = ¹/₂Kx² = ¹/₂ (3786.72)(0.15)² = 42.6 J
This is equal to elastic potential energy stored in the spring,
Then, kinetic energy of the spring is given as:
K.E = E - W
K.E = 113.19 J - 42.6 J
K.E = 70.59 J
To determine the speed of the block due to this energy:
KE = ¹/₂mv²
70.59 = ¹/₂ x 2.1 x v²
70.59 = 1.05v²
v² = 70.59 / 1.05
v² = 67.229
v = √67.229
v = 8.2 m/s
