• ### Why can't we see the spokes of a wheel when it goes very fast?

6 answers · Other - Science · 3 days ago
• ### How do animals see in the dark?

9 answers · Biology · 3 days ago
• ### Simplify the Permutations of [Math]?

1. (n+6)! -------- (n+4)! 2. (n+1)! -------- (n-1)! 3. (n-r+1)! ---------- (n-r-1)!
1. (n+6)! -------- (n+4)! 2. (n+1)! -------- (n-1)! 3. (n-r+1)! ---------- (n-r-1)!
2 answers · Mathematics · 1 week ago
• ### Hyperboola?

The line 2y=x+7 intersects the locus (2t, 2/t) at A and B. Find the values of t corresponding to to A and B and the coordinate of the point of intersection of the tangent at A&B.
The line 2y=x+7 intersects the locus (2t, 2/t) at A and B. Find the values of t corresponding to to A and B and the coordinate of the point of intersection of the tangent at A&B.
2 answers · Mathematics · 2 weeks ago
• ### Simple Harmonic Motion Physics Question URGENT?

A simple pendulum has a period of 4.2s. When the pendulum is shortened by 1m, the period is 3.7s. From these measurements, calculate the acceleration of free-fall g and the original length of the pendulum. If the pendulum is taken from the earth to the moon where the acceleration of free-fall is g/6, what relative change , if any, occurs in the... show more
A simple pendulum has a period of 4.2s. When the pendulum is shortened by 1m, the period is 3.7s. From these measurements, calculate the acceleration of free-fall g and the original length of the pendulum. If the pendulum is taken from the earth to the moon where the acceleration of free-fall is g/6, what relative change , if any, occurs in the period T? Given answers: (i) 10m/s² (ii) 4.5m (iii)2.45:0.1
1 answer · Physics · 3 weeks ago
• ### Math(ellipse)?

A diameter of ellipse 9x²+16y²=144 is inclined to the x-axis at an angle whose tangent is 2. (i) Find the pamametrs of the ends of the diameter. (ii) Find the parameters of the ends of the perpendicular diameter. Ans provided: arc tan(8/3), π+arc tan(8/3); arc tan(-2/3), π+arc tan(-2/3)
A diameter of ellipse 9x²+16y²=144 is inclined to the x-axis at an angle whose tangent is 2. (i) Find the pamametrs of the ends of the diameter. (ii) Find the parameters of the ends of the perpendicular diameter. Ans provided: arc tan(8/3), π+arc tan(8/3); arc tan(-2/3), π+arc tan(-2/3)
1 answer · Mathematics · 4 weeks ago
• ### 😀 pls do this ellipse question__math?

Find the eccentric angles of the ends of the double ordinates which pass through the foci of the ellipse x²+2y²=2. Given the ans: (π/4), (7π/4),; (3π/4, (5π/4)
Find the eccentric angles of the ends of the double ordinates which pass through the foci of the ellipse x²+2y²=2. Given the ans: (π/4), (7π/4),; (3π/4, (5π/4)
3 answers · Mathematics · 1 month ago
• ### Math Masters (ellipse)?

A diameter of ellipse 9x²+16y²=144 is inclined to the x-axis at an angle whose tangent is 2. (i) Find the pamametrs of the ends of the diameter. (ii) Find the parameters of the ends of the perpendicular diameter. Ans provided: arc tan(8/3), π+arc tan(8/3); arc tan(-2/3), π+arc tan(-2/3)
A diameter of ellipse 9x²+16y²=144 is inclined to the x-axis at an angle whose tangent is 2. (i) Find the pamametrs of the ends of the diameter. (ii) Find the parameters of the ends of the perpendicular diameter. Ans provided: arc tan(8/3), π+arc tan(8/3); arc tan(-2/3), π+arc tan(-2/3)
Mathematics · 1 month ago
• ### Physics S.H.M (Simple Harmonic Motion)?

A mass X of 0.1kg is attached to the free end of a vertical helical spring whose upper end is fixed and the spring extends by 0.04m. X is now pulled down a small distance 0.02m and then released. Find: (i) its period, (ii) the maximum force acting onit during the oscillations, (iii) its kinetic energy when X passes through its mean position ... show more
A mass X of 0.1kg is attached to the free end of a vertical helical spring whose upper end is fixed and the spring extends by 0.04m. X is now pulled down a small distance 0.02m and then released. Find: (i) its period, (ii) the maximum force acting onit during the oscillations, (iii) its kinetic energy when X passes through its mean position Ans:: (i) 0.4s (ii) 0.5N (iii) 0.005J
1 answer · Physics · 1 month ago
• ### What's up ?Math of ellipse?

A diameter of ellipse 9x²+16y²=144 is inclined to the x-axis at an angle whose tangent is 2. (i) Find the pamametrs of the ends of the diameter. (ii) Find the parameters of the ends of the perpendicular diameter. Ans provided: arc tan(8/3), π+arc tan(8/3); arc tan(-2/3), π+arc tan(-2/3)
A diameter of ellipse 9x²+16y²=144 is inclined to the x-axis at an angle whose tangent is 2. (i) Find the pamametrs of the ends of the diameter. (ii) Find the parameters of the ends of the perpendicular diameter. Ans provided: arc tan(8/3), π+arc tan(8/3); arc tan(-2/3), π+arc tan(-2/3)
Mathematics · 1 month ago
• ### Whatssup, mathematics-ellipde?

A diameter of ellipse 9x²+16y²=144 is inclined to the x-axis at an angle whose tangent is 2. (i) Find the pamametrs of the ends of the diameter. (ii) Find the parameters of the ends of the perpendicular diameter. Ans provided: arc tan(8/3), π+arc tan(8/3); arc tan(-2/3), π+arc tan(-2/3)
A diameter of ellipse 9x²+16y²=144 is inclined to the x-axis at an angle whose tangent is 2. (i) Find the pamametrs of the ends of the diameter. (ii) Find the parameters of the ends of the perpendicular diameter. Ans provided: arc tan(8/3), π+arc tan(8/3); arc tan(-2/3), π+arc tan(-2/3)
Mathematics · 1 month ago
• ### CALLING Physics Experts solve this question?

As shown in fig. a bullet of mass 100g travels horizontally with initial velocity u towards a wooden ball B of mass 500g, which is suspended from point O by a light string of length L=0.5m. After collision the bullet A remains embedded in ball B and move upwards in a vertical circle. If the objects can just reach the highest point C and complete the... show more
As shown in fig. a bullet of mass 100g travels horizontally with initial velocity u towards a wooden ball B of mass 500g, which is suspended from point O by a light string of length L=0.5m. After collision the bullet A remains embedded in ball B and move upwards in a vertical circle. If the objects can just reach the highest point C and complete the circular motion, determine: (a) the speed of the bodies at C; (b) the speed of the bodies immediately after the collision; (c) the initial velocity u of the bullet; (d) the energy lost by the system due to the collision. Ans provided: (a). 2.21m/s (b) 4.95m/s (c) 29.7m (d) 36.8J
Physics · 1 month ago
• ### Physics CIRCULAR MOTION, ⚠⚠⚠urgent?

The radius of a curved road in certain stretch of highway is 100m, and a car is travelling at a speed of 90km/h. If the road surface is smooth, what is the angle between the road surface and the horizontal to avoid skidding? Ans provided: 32.5°
The radius of a curved road in certain stretch of highway is 100m, and a car is travelling at a speed of 90km/h. If the road surface is smooth, what is the angle between the road surface and the horizontal to avoid skidding? Ans provided: 32.5°
1 answer · Physics · 1 month ago
• ### What;s up physics? Circular motion.?

The figure shows a big smooth semi spherical bowl of radius R=0.65m. A small glass ball is making a horizontal circular motion of angular velocity w at a height of 0.4m from he bottom of the bowl along the smooth internal wall of the bowl. Calculate: (i) the radius r of the circular motion; (ii) the magnitude of the angular velocity, w, of the... show more
The figure shows a big smooth semi spherical bowl of radius R=0.65m. A small glass ball is making a horizontal circular motion of angular velocity w at a height of 0.4m from he bottom of the bowl along the smooth internal wall of the bowl. Calculate: (i) the radius r of the circular motion; (ii) the magnitude of the angular velocity, w, of the glass ball. Given that the answers: Q1: 0.6 m Q2: 6.26 rad/s
Physics · 1 month ago
• ### Physics PROs pls solve this circular motion question:?

An object of mass 0.5kg is rotated in a horizontal circle by a string 1m long. The maximum tension in the string before it breaks is 50 N. What is the greatest number ofrevolutions per second of the object? Answer Provided: 1.6 rev/s
An object of mass 0.5kg is rotated in a horizontal circle by a string 1m long. The maximum tension in the string before it breaks is 50 N. What is the greatest number ofrevolutions per second of the object? Answer Provided: 1.6 rev/s
Physics · 1 month ago
• ### Asking for Physics pro's help?

An object of mass 0.5kg is rotated in a horizontal circle by a string 1m long. The maximum tension in the string before it breaks is 50 N. What is the greatest number ofrevolutions per second of the object? Ans Provided: 1.6 rev/s
An object of mass 0.5kg is rotated in a horizontal circle by a string 1m long. The maximum tension in the string before it breaks is 50 N. What is the greatest number ofrevolutions per second of the object? Ans Provided: 1.6 rev/s
Physics · 1 month ago
• ### What's up? physics _related to circular motion?

An object of mass 0.5kg is rotated in a horizontal circle by a string 1m long. The maximum tension in the string before it breaks is 50 N. What is the greatest number ofrevolutions per second of the object? Ans Provided: 1.6 rev/s
An object of mass 0.5kg is rotated in a horizontal circle by a string 1m long. The maximum tension in the string before it breaks is 50 N. What is the greatest number ofrevolutions per second of the object? Ans Provided: 1.6 rev/s
1 answer · Physics · 1 month ago
• ### Physics dynamics & circular motion?

A spaceman in training is rotated in a seat at the end of a horizontal rotating arm of length 5m. If he can withstans the accelerations up to 9g, what is the maximum number of revolutions per second permissible? (The acceleration of free-fall may be taken as 10m/s²) Ans provided: 0.675rev/s
A spaceman in training is rotated in a seat at the end of a horizontal rotating arm of length 5m. If he can withstans the accelerations up to 9g, what is the maximum number of revolutions per second permissible? (The acceleration of free-fall may be taken as 10m/s²) Ans provided: 0.675rev/s
1 answer · Physics · 1 month ago
• ### Physics (circular motion)?

Calculate the force necessary to keep a mass of 0.2kg moving in a horizontal circle of radius 0.5m with a period of 0.5s. What is the direction of the force? Modal answer: 15.8N
Calculate the force necessary to keep a mass of 0.2kg moving in a horizontal circle of radius 0.5m with a period of 0.5s. What is the direction of the force? Modal answer: 15.8N
1 answer · Physics · 1 month ago
• ### What's up? Physics (circular motion)?

An object of mass 10kg is whirled round a horizontalcircle of radius 4m by a revolving string is inclined to the vertical. If the uniform speed of the object is 5m/s, calculate (i) the tension in the string, (ii) the angle of inclination of the string to the vertical. Answer provided: (i) 118N (ii) 32°
An object of mass 10kg is whirled round a horizontalcircle of radius 4m by a revolving string is inclined to the vertical. If the uniform speed of the object is 5m/s, calculate (i) the tension in the string, (ii) the angle of inclination of the string to the vertical. Answer provided: (i) 118N (ii) 32°
Physics · 1 month ago