Anonymous
11 hours ago
A swimmer crosses at 60m wide river flowing at 2m/s. if the swimmer swims directly a cross at 3m/s, find the resultant velocity??
Physical
1 view
1 view
2 answers
Sort By
Google Gemini AI
11 hours ago
The velocity of the swimmer relative to the riverbank is:
```
V = sqrt(Vx^2 + Vy^2)
```
where:
- V is the resultant velocity
- Vx is the velocity of the swimmer in the x-direction (across the river)
- Vy is the velocity of the swimmer in the y-direction (downstream)
In this case, Vx = 3 m/s and Vy = 2 m/s. So, the resultant velocity is:
```
V = sqrt(3^2 + 2^2) = 3.6 m/s
```
The angle of the resultant velocity is:
```
θ = arctan(Vy / Vx) = arctan(2 / 3) = 33.7°
```
So, the swimmer crosses the river at a speed of 3.6 m/s at an angle of 33.7° downstream from the perpendicular.
```
V = sqrt(Vx^2 + Vy^2)
```
where:
- V is the resultant velocity
- Vx is the velocity of the swimmer in the x-direction (across the river)
- Vy is the velocity of the swimmer in the y-direction (downstream)
In this case, Vx = 3 m/s and Vy = 2 m/s. So, the resultant velocity is:
```
V = sqrt(3^2 + 2^2) = 3.6 m/s
```
The angle of the resultant velocity is:
```
θ = arctan(Vy / Vx) = arctan(2 / 3) = 33.7°
```
So, the swimmer crosses the river at a speed of 3.6 m/s at an angle of 33.7° downstream from the perpendicular.
-1
Agegnehu Aweke
11 hours ago
36. Which two STIs are specifically mentioned as components that can lead to severe adverse
outcomes, including embryonic death and developmental impairments?
A. Treponemapallidum and Mycoplasma genitalium
B. Neisseria gonorrhoeae and Chlamydia trachomatis
C. Herpes Simplex Virus and Cytomegalovirus
D. Trichomonasvaginalis and Human Papillomavirus
37. Which of the following is NOT a preconception intervention recommended for women at
risk of malaria?
A) Use insecticide-treated nets (ITNs)
B) Screen and treat with rapid diagnostic tests (RDTs)
C) Avoid any form of exercise
D) Provide antimalarial prophylaxis
38. What is a significant risk of untreated tuberculosis (TB) during pregnancy?
A) Increased fetal weight
B) Low birth weight and fetal distress
C) Improved maternal health
D) Enhanced fetal brain development
39. Which vaccine is essential for preventing maternal and neonatal tetanus (MNT)?
A) Tetanus-diphtheria vaccine (Td)
B) Influenza vaccine
C) Measles vaccine
D) Hepatitis B vaccine
40. What is the primary preconception intervention recommended for women with a history
of recurrent early pregnancy losses?
A. Genetic counseling and testing
B. Immediate conception attempts
C. Avoidance of any medications
D. Increase physical activity
41. A 28-year-old woman comes to the clinic for preconception counseling. She has a history
of two miscarriages in the first trimester. During the visit, she mentions that her sister has
a genetic condition that led to multiple birth defects. What should be the primary focus of
the preconception counseling for this patient?
A. Increase physical activity before conception
B. Advise immediate attempts to conceive
C. Discuss the importance of genetic counseling and testing
D. Suggest dietary modifications to improve fertility
42. A 22-year-old pregnant woman presents with symptoms of a sexually transmitted
infection (STI). Upon evaluation, she is diagnosed with chlamydia. What is a significant
risk of untreated chlamydia infection during pregnancy?
A) Increased fetal weight
B) Maternal health improvement
C) Enhanced fetal development
D) Preterm labor and low birth weight
outcomes, including embryonic death and developmental impairments?
A. Treponemapallidum and Mycoplasma genitalium
B. Neisseria gonorrhoeae and Chlamydia trachomatis
C. Herpes Simplex Virus and Cytomegalovirus
D. Trichomonasvaginalis and Human Papillomavirus
37. Which of the following is NOT a preconception intervention recommended for women at
risk of malaria?
A) Use insecticide-treated nets (ITNs)
B) Screen and treat with rapid diagnostic tests (RDTs)
C) Avoid any form of exercise
D) Provide antimalarial prophylaxis
38. What is a significant risk of untreated tuberculosis (TB) during pregnancy?
A) Increased fetal weight
B) Low birth weight and fetal distress
C) Improved maternal health
D) Enhanced fetal brain development
39. Which vaccine is essential for preventing maternal and neonatal tetanus (MNT)?
A) Tetanus-diphtheria vaccine (Td)
B) Influenza vaccine
C) Measles vaccine
D) Hepatitis B vaccine
40. What is the primary preconception intervention recommended for women with a history
of recurrent early pregnancy losses?
A. Genetic counseling and testing
B. Immediate conception attempts
C. Avoidance of any medications
D. Increase physical activity
41. A 28-year-old woman comes to the clinic for preconception counseling. She has a history
of two miscarriages in the first trimester. During the visit, she mentions that her sister has
a genetic condition that led to multiple birth defects. What should be the primary focus of
the preconception counseling for this patient?
A. Increase physical activity before conception
B. Advise immediate attempts to conceive
C. Discuss the importance of genetic counseling and testing
D. Suggest dietary modifications to improve fertility
42. A 22-year-old pregnant woman presents with symptoms of a sexually transmitted
infection (STI). Upon evaluation, she is diagnosed with chlamydia. What is a significant
risk of untreated chlamydia infection during pregnancy?
A) Increased fetal weight
B) Maternal health improvement
C) Enhanced fetal development
D) Preterm labor and low birth weight
0
