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A 50kg box is pushed across the floor with a force of 78N.A retarding force due to friction between the box and the floor also acts on it. If it is starting from rest and attains a kinetic energy of 230J after being pushed 5m. Find out the net force acting on it. What will be the value of the retarding frictional force described above that opposes the motion?
A 115 mCi radioactive tracer is made in a reactor. When delivered to a hospital 16 hours later its activity is 95 mCi. For how long (in hours) is the sample usable
What stage of the scientific method would someone be at if they make a prediction that drinking alcohol will make people more violent throughout a sporting event.
Assume you observe the Moon under ideal conditions, both with your naked eye and by using the telescope at Mount Palomar. Estimate the linear distance between two features on the Moon
The minimum stopping distance for a car travelling at a speed of 30 {rm m/s} is 60 {rm m}, including the distance travelled during the driver's reaction time of 0.54 {rm s}.
Each of the following objects has a radius of 0.188 m and a mass of 2.71 kg, Find the magnitude of the angular momentum of each object
Assume a small child rolls off a bed that is 0.38m above the floor. If the floor is hardwood, the child's head is brought to rest in approximately 2.2mm. If the floor is carpeted, this stopping distance is increased to about 1.1cm.
Up where the ISS (International Space Station) orbits at 387 km, even though they are weightless there still is an acceleration due to gravity. Calculate its value and what it is in respect to 8g at the Earth's surface.
A material has an index of refraction of 1.980. What is the critical angle for internal reflection inside a block of this material that is in air
A 2.40 MHz sound wave travels through a pregnant lady's abdomen and is reflected from the fetal heart wall of her unborn baby. Find the speed of the fetal heart wall at the instant this measurement is made
a researcher measures the concentration of advil in a patients bloodstream as a function of time making measurements
Average relative intensity of a person's voice is 58 dB. A microphone and amplification system increases the relative intensity to 70 dB. By what factor did the amplification system increase the sound intensity?
q1. a 80-g ball collides elastically with a 350-g ball that is at rest. if the 80-g ball was travelling in the positive
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